diff --git a/abis_mapping/templates/survey_occurrence_data_v2/mapping.py b/abis_mapping/templates/survey_occurrence_data_v2/mapping.py
index 8c7f18d6..a48ad075 100644
--- a/abis_mapping/templates/survey_occurrence_data_v2/mapping.py
+++ b/abis_mapping/templates/survey_occurrence_data_v2/mapping.py
@@ -542,7 +542,7 @@ def apply_mapping_row(
         # Create Tern Site IRI, depending on the siteID field
         site_id: str | None = row["siteID"]
         if site_id:
-            site = utils.iri_patterns.site_iri(base_iri, site_id)
+            site = utils.iri_patterns.legacy_site_iri(base_iri, site_id)
         else:
             site = None
 
diff --git a/abis_mapping/templates/survey_occurrence_data_v3/examples/margaret_river_flora/margaret_river_flora.csv b/abis_mapping/templates/survey_occurrence_data_v3/examples/margaret_river_flora/margaret_river_flora.csv
index 92d7c5c3..fd97338d 100644
--- a/abis_mapping/templates/survey_occurrence_data_v3/examples/margaret_river_flora/margaret_river_flora.csv
+++ b/abis_mapping/templates/survey_occurrence_data_v3/examples/margaret_river_flora/margaret_river_flora.csv
@@ -13,5 +13,5 @@ providerRecordID,providerRecordIDSource,locality,decimalLatitude,decimalLongitud
 12,WAM,,-33.8,115.21,WGS84,,,26/09/2019,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,Caladenia excelsa,,,,Plantae,,,,,,,,,,,,,
 13,WAM,Cowaramup Bay Road,-33.86,115.02,WGS84,,,26/09/2019,,,PreservedSpecimen,Stream Environment and Water Pty Ltd,,,,,,,,,,,,,,C01,CC123,WAM,,,,,,,,,Stream Environment and Water Pty Ltd,,Caladenia excelsa,,,,Plantae,,,,,,,,,,,,,
 14,WAM,Cowaramup Bay Road,-33.86,115.02,WGS84,20,Coordinates rounded to the nearest 10 km for conservation concern,26/09/2019,,,HumanObservation,Stream Environment and Water Pty Ltd,,,,,,,,,,,,,,C01,CC456,WAM,,,,,,,Caladenia ?excelsa,,Stream Environment and Water Pty Ltd,,Caladenia excelsa,?,Could not confirm the ID due to damaged flower,,Plantae,,,,,,,,,,,,,
-8022FSJMJ079c5cf,WAM,Cowaramup Bay Road,-33.8,115.21,WGS84,50,Coordinates rounded to the nearest 10 km for conservation concern,26/09/2019,,human observation,PreservedSpecimen,Stream Environment and Water Pty Ltd,PE:12:8832,present,"Closed forest of Melaleuca lanceolata. White, grey or brown sand, sandy loam.",native,Dried out leaf tips,2,,,adult,male,No breeding evident,MR-456,Stream Environment and Water Pty Ltd,32237,ARACH,WAM,BHP2012-7521 | M12378,BHP,Wet (in ethanol or some other preservative),26/09/2019,https://www.ncbi.nlm.nih.gov/nuccore/MH040669.1 | https://www.ncbi.nlm.nih.gov/nuccore/MH040616.1,Sanger dideoxy sequencing,Caladenia ?excelsa,2019-09-27T12:34+08:00,Stream Environment and Water Pty Ltd,Visually identified in the field (sighting),Caladenia excelsa,species incerta,no flowers present,Caladenia excelsa Hopper & A.P.Br.,Plantae,species,VU,WA,Check against Threatened and Priority Fauna List WA available from https://www.dpaw.wa.gov.au/plants-and-animals/threatened-species-and-communities/threatened-animals. Last updated 13 June 2022,,WA-BIO,Category 1,Department of Biodiversity and Conservation,MR-R1,MR-S1,WAM,,MR-R1-V1
+8022FSJMJ079c5cf,WAM,Cowaramup Bay Road,-33.8,115.21,WGS84,50,Coordinates rounded to the nearest 10 km for conservation concern,26/09/2019,,human observation,PreservedSpecimen,Stream Environment and Water Pty Ltd,PE:12:8832,present,"Closed forest of Melaleuca lanceolata. White, grey or brown sand, sandy loam.",native,Dried out leaf tips,2,,,adult,male,No breeding evident,MR-456,Stream Environment and Water Pty Ltd,32237,ARACH,WAM,BHP2012-7521 | M12378,BHP,Wet (in ethanol or some other preservative),26/09/2019,https://www.ncbi.nlm.nih.gov/nuccore/MH040669.1 | https://www.ncbi.nlm.nih.gov/nuccore/MH040616.1,Sanger dideoxy sequencing,Caladenia ?excelsa,2019-09-27T12:34+08:00,Stream Environment and Water Pty Ltd,Visually identified in the field (sighting),Caladenia excelsa,species incerta,no flowers present,Caladenia excelsa Hopper & A.P.Br.,Plantae,species,VU,WA,Check against Threatened and Priority Fauna List WA available from https://www.dpaw.wa.gov.au/plants-and-animals/threatened-species-and-communities/threatened-animals. Last updated 13 June 2022,,WA-BIO,Category 1,Department of Biodiversity and Conservation,MR-R1,MR-S1,WAM,https://example.com/site/WAM-MR-S1,MR-R1-V1
 ABC123,WAM,Cowaramup Bay Road,-33.8,115.21,WGS84,30,Coordinates generalised,26/09/2019,,new sampling protocol,new basis of record,Stream Environment and Water Pty Ltd,PE:12:8833,new occurrence status,new habitat,new establishment means,Leaves brown,6,,,new life stage,new sex,new reproductiveCondition,MR-457,Stream Environment and Water Pty Ltd,32238,ARACH,WAM,BHP2012-7522 | M12379,BHP,new preparations,27/09/2019,https://www.ncbi.nlm.nih.gov/nuccore/MH040669.1 | https://www.ncbi.nlm.nih.gov/nuccore/MH040616.1,new sequencing method,Caladenia ?excelsa,2019-09-27T12:34+08:00,Stream Environment and Water Pty Ltd,new identification method,Caladenia excelsa,new identification qualifier,new remarks,Caladenia excelsa Hopper & A.P.Br.,new kingdom,new taxon rank,new threat status,WA,a random selection,,,Category 1,Department of Biodiversity and Conservation,MR-R1,MR-S1,WAM,,
diff --git a/abis_mapping/templates/survey_occurrence_data_v3/examples/margaret_river_flora/margaret_river_flora.ttl b/abis_mapping/templates/survey_occurrence_data_v3/examples/margaret_river_flora/margaret_river_flora.ttl
index 6169f338..2afd1820 100644
--- a/abis_mapping/templates/survey_occurrence_data_v3/examples/margaret_river_flora/margaret_river_flora.ttl
+++ b/abis_mapping/templates/survey_occurrence_data_v3/examples/margaret_river_flora/margaret_river_flora.ttl
@@ -770,6 +770,16 @@
     skos:prefLabel "Stream Environment and Water Pty Ltd recordNumber" ;
     prov:wasAttributedTo <https://linked.data.gov.au/dataset/bdr/org/Stream-Environment-and-Water-Pty-Ltd> .
 
+<https://linked.data.gov.au/dataset/bdr/datatypes/siteID/WAM> a rdfs:Datatype ;
+    skos:definition "An identifier for the site" ;
+    skos:prefLabel "WAM Site ID" ;
+    prov:qualifiedAttribution <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/attribution/WAM/resourceProvider> .
+
+<https://example.com/site/WAM-MR-S1> a tern:FeatureOfInterest,
+        tern:Site ;
+    schema:identifier "MR-S1"^^<https://linked.data.gov.au/dataset/bdr/datatypes/siteID/WAM> ;
+    tern:featureType <http://linked.data.gov.au/def/tern-cv/5bf7ae21-a454-440b-bdd7-f2fe982d8de4> .
+
 <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/SiteVisit/MR-R1-V1> a tern:SiteVisit ;
     schema:isPartOf <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000> .
 
@@ -897,10 +907,6 @@
     prov:agent <https://linked.data.gov.au/dataset/bdr/org/Stream-Environment-and-Water-Pty-Ltd> ;
     prov:hadRole <https://linked.data.gov.au/def/data-roles/owner> .
 
-<https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/attribution/WAM/resourceProvider> a prov:Attribution ;
-    prov:agent <https://linked.data.gov.au/dataset/bdr/org/WAM> ;
-    prov:hadRole <https://linked.data.gov.au/def/data-roles/resourceProvider> .
-
 <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/bdr-cv/attribute/basisOfRecord/new-basis-of-record> a skos:Concept ;
     skos:broader <http://example.com/bdr-cv/attribute/basisOfRecord> ;
     skos:definition "A type of basisOfRecord." ;
@@ -1309,14 +1315,17 @@
 <https://linked.data.gov.au/dataset/bdr/org/WA-BIO> a prov:Agent ;
     schema:name "WA-BIO" .
 
-<https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/Site/MR-S1> a tern:FeatureOfInterest,
+<https://linked.data.gov.au/dataset/bdr/site/WAM/MR-S1> a tern:FeatureOfInterest,
         tern:Site ;
-    schema:isPartOf <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000> ;
     tern:featureType <http://linked.data.gov.au/def/tern-cv/5bf7ae21-a454-440b-bdd7-f2fe982d8de4> .
 
 <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/Survey/MR-R1> a tern:Survey ;
     schema:isPartOf <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000> .
 
+<https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/attribution/WAM/resourceProvider> a prov:Attribution ;
+    prov:agent <https://linked.data.gov.au/dataset/bdr/org/WAM> ;
+    prov:hadRole <https://linked.data.gov.au/def/data-roles/resourceProvider> .
+
 <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/bdr-cv/methods/identificationMethod/Visually-identified-in-the-field-sighting> a skos:Concept ;
     skos:broader <http://example.com/bdr-cv/methods/identificationMethod> ;
     skos:definition "A type of identificationMethod." ;
@@ -1689,7 +1698,7 @@
     dwc:catalogNumber "ARACH"^^<https://linked.data.gov.au/dataset/bdr/datatypes/catalogNumber/WAM> ;
     dwc:collectionCode "32237" ;
     prov:wasAssociatedWith <https://linked.data.gov.au/dataset/bdr/org/Stream-Environment-and-Water-Pty-Ltd> ;
-    sosa:isSampleOf <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/Site/MR-S1> ;
+    sosa:isSampleOf <https://example.com/site/WAM-MR-S1> ;
     sosa:usedProcedure <http://linked.data.gov.au/def/tern-cv/ea1d6342-1901-4f88-8482-3111286ec157> ;
     schema:identifier "BHP2012-7521"^^<https://linked.data.gov.au/dataset/bdr/datatypes/catalogNumber/BHP>,
         "M12378"^^<https://linked.data.gov.au/dataset/bdr/datatypes/catalogNumber/BHP>,
@@ -1710,7 +1719,7 @@
     dwc:catalogNumber "ARACH"^^<https://linked.data.gov.au/dataset/bdr/datatypes/catalogNumber/WAM> ;
     dwc:collectionCode "32238" ;
     prov:wasAssociatedWith <https://linked.data.gov.au/dataset/bdr/org/Stream-Environment-and-Water-Pty-Ltd> ;
-    sosa:isSampleOf <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/Site/MR-S1> ;
+    sosa:isSampleOf <https://linked.data.gov.au/dataset/bdr/site/WAM/MR-S1> ;
     sosa:usedProcedure <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/bdr-cv/methods/samplingProtocol/new-sampling-protocol> ;
     schema:identifier "BHP2012-7522"^^<https://linked.data.gov.au/dataset/bdr/datatypes/catalogNumber/BHP>,
         "M12379"^^<https://linked.data.gov.au/dataset/bdr/datatypes/catalogNumber/BHP>,
diff --git a/abis_mapping/templates/survey_occurrence_data_v3/examples/organism_qty.ttl b/abis_mapping/templates/survey_occurrence_data_v3/examples/organism_qty.ttl
index a742f61d..ea37967c 100644
--- a/abis_mapping/templates/survey_occurrence_data_v3/examples/organism_qty.ttl
+++ b/abis_mapping/templates/survey_occurrence_data_v3/examples/organism_qty.ttl
@@ -46,11 +46,6 @@
     skos:prefLabel "Gaia Resources recordID" ;
     prov:qualifiedAttribution <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/attribution/Gaia-Resources/resourceProvider> .
 
-<https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/Site/P1> a tern:FeatureOfInterest,
-        tern:Site ;
-    schema:isPartOf <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000> ;
-    tern:featureType <http://linked.data.gov.au/def/tern-cv/5bf7ae21-a454-440b-bdd7-f2fe982d8de4> .
-
 <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/attribution/Gaia-Resources/resourceProvider> a prov:Attribution ;
     prov:agent <https://linked.data.gov.au/dataset/bdr/org/Gaia-Resources> ;
     prov:hadRole <https://linked.data.gov.au/def/data-roles/resourceProvider> .
@@ -72,9 +67,13 @@
 <https://linked.data.gov.au/dataset/bdr/org/Gaia-Resources> a prov:Agent ;
     schema:name "Gaia Resources" .
 
+<https://linked.data.gov.au/dataset/bdr/site/TERN/P1> a tern:FeatureOfInterest,
+        tern:Site ;
+    tern:featureType <http://linked.data.gov.au/def/tern-cv/5bf7ae21-a454-440b-bdd7-f2fe982d8de4> .
+
 <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/occurrence/A0010> a dwc:Occurrence,
         tern:FeatureOfInterest ;
-    sosa:isSampleOf <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/Site/P1> ;
+    sosa:isSampleOf <https://linked.data.gov.au/dataset/bdr/site/TERN/P1> ;
     sosa:usedProcedure <https://linked.data.gov.au/def/nrm/a8db263e-7a39-5b85-a5d2-8e1af7ce1e39> ;
     schema:isPartOf <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000> ;
     schema:spatial _:Nb0c3d4fa822b88b4d3f8743700000000 ;
diff --git a/abis_mapping/templates/survey_occurrence_data_v3/mapping.py b/abis_mapping/templates/survey_occurrence_data_v3/mapping.py
index 5b890a34..82b0172e 100644
--- a/abis_mapping/templates/survey_occurrence_data_v3/mapping.py
+++ b/abis_mapping/templates/survey_occurrence_data_v3/mapping.py
@@ -561,13 +561,30 @@ def apply_mapping_row(
         else:
             survey = None
 
-        # Create Tern Site IRI, depending on the siteID field
+        # Create Tern Site IRI, depending on the site fields
         site_id: str | None = row["siteID"]
-        if site_id:
-            site = utils.iri_patterns.site_iri(base_iri, site_id)
+        site_id_source: str | None = row["siteIDSource"]
+        existing_site_iri: str | None = row["existingBDRSiteIRI"]
+        if existing_site_iri:
+            site = rdflib.URIRef(existing_site_iri)
+        elif site_id and site_id_source:
+            site = utils.iri_patterns.site_iri(site_id_source, site_id)
         else:
             site = None
 
+        # When both existingBDRSiteIRI and siteID+siteIDSource are provided,
+        # the site gets a schema:identifier with this datatype.
+        if existing_site_iri and site_id and site_id_source:
+            site_id_datatype = utils.iri_patterns.datatype_iri("siteID", site_id_source)
+            site_id_datatype_attribution = utils.iri_patterns.attribution_iri(
+                base_iri, "resourceProvider", site_id_source
+            )
+            site_id_datatype_agent = utils.iri_patterns.agent_iri("org", site_id_source)
+        else:
+            site_id_datatype = None
+            site_id_datatype_attribution = None
+            site_id_datatype_agent = None
+
         # Conditionally create uri dependent on siteVisitID field.
         site_visit_id: str | None = row["siteVisitID"]
         if site_visit_id:
@@ -1207,7 +1224,26 @@ def apply_mapping_row(
         # Add site
         self.add_site(
             uri=site,
-            dataset=dataset,
+            site_id=site_id,
+            site_id_datatype=site_id_datatype,
+            graph=graph,
+        )
+
+        self.add_site_id_datatype(
+            uri=site_id_datatype,
+            site_id_source=site_id_source,
+            site_id_datatype_attribution=site_id_datatype_attribution,
+            graph=graph,
+        )
+        self.add_attribution(
+            uri=site_id_datatype_attribution,
+            provider=site_id_datatype_agent,
+            provider_role_type=DATA_ROLE_RESOURCE_PROVIDER,
+            graph=graph,
+        )
+        self.add_site_id_datatype_agent(
+            uri=site_id_datatype_agent,
+            site_id_source=site_id_source,
             graph=graph,
         )
 
@@ -4116,15 +4152,18 @@ def add_organism_quantity_value(
 
     def add_site(
         self,
+        *,
         uri: rdflib.URIRef | None,
-        dataset: rdflib.URIRef,
+        site_id: str | None,
+        site_id_datatype: rdflib.URIRef | None,
         graph: rdflib.Graph,
     ) -> None:
         """Adds site to the graph.
 
         Args:
             uri (rdflib.URIRef | None): URI to use if site provided else None.
-            dataset (rdflib.URIRef): The dataset which the data belongs.
+            site_id: Value of siteID field from the Row.
+            site_id_datatype: Datatype to use for the site id literal.
             graph (rdflib.URIRef): Graph to be modified.
         """
         # Check site uri exists
@@ -4134,9 +4173,64 @@ def add_site(
         # Add site information to graph
         graph.add((uri, a, utils.namespaces.TERN.Site))
         graph.add((uri, a, utils.namespaces.TERN.FeatureOfInterest))
-        graph.add((uri, rdflib.SDO.isPartOf, dataset))
         graph.add((uri, utils.namespaces.TERN.featureType, vocabs.site_type.SITE.iri))
 
+        if site_id_datatype is not None and site_id:
+            graph.add((uri, rdflib.SDO.identifier, rdflib.Literal(site_id, datatype=site_id_datatype)))
+
+    def add_site_id_datatype(
+        self,
+        *,
+        uri: rdflib.URIRef | None,
+        site_id_source: str | None,
+        site_id_datatype_attribution: rdflib.URIRef | None,
+        graph: rdflib.Graph,
+    ) -> None:
+        """Adds site id datatype to the graph.
+
+        Args:
+            uri: Subject of the node.
+            site_id_source: The siteIDSource value from the row.
+            site_id_datatype_attribution: The datatype attribution node.
+            graph: Graph to be modified.
+        """
+        # Check subject was provided
+        if uri is None:
+            return
+        # Add type
+        graph.add((uri, a, rdflib.RDFS.Datatype))
+        # Add definition
+        graph.add((uri, rdflib.SKOS.definition, rdflib.Literal("An identifier for the site")))
+        # Add label
+        if site_id_source:
+            graph.add((uri, rdflib.SKOS.prefLabel, rdflib.Literal(f"{site_id_source} Site ID")))
+        # Add attribution link
+        if site_id_datatype_attribution:
+            graph.add((uri, rdflib.PROV.qualifiedAttribution, site_id_datatype_attribution))
+
+    def add_site_id_datatype_agent(
+        self,
+        *,
+        uri: rdflib.URIRef | None,
+        site_id_source: str | None,
+        graph: rdflib.Graph,
+    ) -> None:
+        """Adds the site id datatype agent to the graph.
+
+        Args:
+            uri: Subject of the node.
+            site_id_source: The siteIDSource value from the row.
+            graph: Graph to be modified.
+        """
+        # Check subject provided
+        if uri is None:
+            return
+        # Add type
+        graph.add((uri, a, rdflib.PROV.Agent))
+        # Add name
+        if site_id_source:
+            graph.add((uri, rdflib.SDO.name, rdflib.Literal(site_id_source)))
+
     def add_sensitivity_category_attribute(
         self,
         uri: rdflib.URIRef | None,
diff --git a/abis_mapping/templates/survey_occurrence_data_v3/validators/validator.ttl b/abis_mapping/templates/survey_occurrence_data_v3/validators/validator.ttl
index d5f44661..a713bdb9 100644
--- a/abis_mapping/templates/survey_occurrence_data_v3/validators/validator.ttl
+++ b/abis_mapping/templates/survey_occurrence_data_v3/validators/validator.ttl
@@ -16,6 +16,7 @@ bdrsh:DatatypeShape
     a rdfs:Class, sh:NodeShape ;
     sh:targetClass rdfs:Datatype ;
     sh:xone (
+        bdrsh:SiteIDDatatypeShape
         bdrsh:RecordIDDatatypeShape 
         bdrsh:RecordNumberDatatypeShape
         bdrsh:CatalogNumberDatatypeShape
@@ -92,6 +93,32 @@ bdrsh:RecordIDDatatypeShape
         sh:class prov:Attribution ;
     ] .
 
+bdrsh:SiteIDDatatypeShape
+    a sh:NodeShape ;
+    sh:property [
+        sh:path skos:prefLabel ;
+        sh:datatype xsd:string ;
+        sh:nodeKind sh:Literal ;
+        sh:minCount 1 ;
+        sh:maxCount 1 ;
+        sh:pattern " Site ID$" ;
+    ] ;
+    sh:property [
+        sh:path skos:definition ;
+        sh:datatype xsd:string ;
+        sh:nodeKind sh:Literal ;
+        sh:minCount 1 ;
+        sh:maxCount 1 ;
+        sh:pattern "^An identifier for the site$" ;
+    ] ;
+    sh:property [
+        sh:path prov:qualifiedAttribution ;
+        sh:minCount 1 ;
+        sh:maxCount 1 ;
+        sh:node bdrsh:AttributionShape ;
+        sh:class prov:Attribution ;
+    ] .
+
 bdrsh:AttributionShape
     a sh:NodeShape ;
     sh:property [
diff --git a/abis_mapping/templates/survey_site_data_v2/mapping.py b/abis_mapping/templates/survey_site_data_v2/mapping.py
index bc762fa0..7f6cfc3e 100644
--- a/abis_mapping/templates/survey_site_data_v2/mapping.py
+++ b/abis_mapping/templates/survey_site_data_v2/mapping.py
@@ -236,7 +236,7 @@ def apply_mapping_row(
         # TERN.Site subject IRI - Note this needs to match the iri construction of the
         # survey site visit and occurrence template mapping, ensuring they will resolve properly.
         site_id: str = row["siteID"]
-        site = utils.iri_patterns.site_iri(base_iri, site_id)
+        site = utils.iri_patterns.legacy_site_iri(base_iri, site_id)
 
         # Conditionally create uris dependent on siteIDSource
         site_id_src: str | None = row["siteIDSource"]
@@ -258,7 +258,7 @@ def apply_mapping_row(
             rtor_site_vocab = self.fields()["relationshipToRelatedSite"].get_vocab()
             if rtor_site_vocab().get(relationship_to_related_site) == rdflib.SDO.isPartOf:
                 # Related site is defined internal to the dataset
-                related_site = utils.iri_patterns.site_iri(base_iri, related_site_id)
+                related_site = utils.iri_patterns.legacy_site_iri(base_iri, related_site_id)
             else:
                 # Related site is defined outside the dataset
                 related_site = utils.rdf.uri_or_string_literal(related_site_id)
diff --git a/abis_mapping/templates/survey_site_data_v3/examples/minimal.csv b/abis_mapping/templates/survey_site_data_v3/examples/minimal.csv
index a3d74b3e..4c4fdeb8 100644
--- a/abis_mapping/templates/survey_site_data_v3/examples/minimal.csv
+++ b/abis_mapping/templates/survey_site_data_v3/examples/minimal.csv
@@ -1,5 +1,5 @@
 siteID,siteIDSource,existingBDRSiteIRI,siteType,siteName,siteDescription,habitat,relatedSiteID,relationshipToRelatedSite,locality,decimalLatitude,decimalLongitude,footprintWKT,geodeticDatum,coordinateUncertaintyInMeters,dataGeneralizations
-P0,WAM,,Site,ParentSite,Footprint of study area,Closed forest,,,Cowaramup Bay Road,,,"POLYGON ((114.98 -33.85, 115.01 -33.85, 115.01 -33.87, 114.98 -33.87, 114.98 -33.85))",WGS84,50,
-P1,WAM,,Plot,Plot 1,Fine woody debris.,Closed forest,P0,partOf,Cowaramup Bay Road,-33.85,114.99,"LINESTRING (114.99 -33.85, 115.00 -33.85)",WGS84,50,Coordinates rounded to the nearest 10 km for conservation concern
+P0,WAM,https://example.com/site/WAM/P0,Site,ParentSite,Footprint of study area,Closed forest,,,Cowaramup Bay Road,,,"POLYGON ((114.98 -33.85, 115.01 -33.85, 115.01 -33.87, 114.98 -33.87, 114.98 -33.85))",WGS84,50,
+,,https://example.com/site/WAM/P1,Plot,Plot 1,Fine woody debris.,Closed forest,P0,partOf,Cowaramup Bay Road,-33.85,114.99,"LINESTRING (114.99 -33.85, 115.00 -33.85)",WGS84,50,Coordinates rounded to the nearest 10 km for conservation concern
 P2,WAM,,Plot,Plot 2,Fine woody debris.,Closed forest,S0,sameAs,Cowaramup Bay Road,-33.85,114.99,"LINESTRING (114.99 -33.85, 115.00 -33.85)",WGS84,50,Coordinates rounded to the nearest 10 km for conservation concern
 P3,WAM,,Plot,Plot 3,Fine woody debris.,Closed forest,http://example.com/site/S0,sameAs,Cowaramup Bay Road,-33.85,114.99,"LINESTRING (114.99 -33.85, 115.00 -33.85)",WGS84,50,Coordinates rounded to the nearest 10 km for conservation concern
diff --git a/abis_mapping/templates/survey_site_data_v3/examples/minimal.ttl b/abis_mapping/templates/survey_site_data_v3/examples/minimal.ttl
index 6b70caca..e8433196 100644
--- a/abis_mapping/templates/survey_site_data_v3/examples/minimal.ttl
+++ b/abis_mapping/templates/survey_site_data_v3/examples/minimal.ttl
@@ -9,18 +9,18 @@
 
 <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/SiteCollection/dataGeneralizations/Coordinates-rounded-to-the-nearest-10-km-for-conservation-concern> a schema:Collection ;
     schema:isPartOf <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000> ;
-    schema:member <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/Site/P1>,
-        <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/Site/P2>,
-        <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/Site/P3> ;
+    schema:member <https://example.com/site/WAM/P1>,
+        <https://linked.data.gov.au/dataset/bdr/site/WAM/P2>,
+        <https://linked.data.gov.au/dataset/bdr/site/WAM/P3> ;
     schema:name "Site Collection - Data Generalizations - Coordinates rounded to the nearest 10 km for conservation concern" ;
     tern:hasAttribute <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/attribute/dataGeneralizations/Coordinates-rounded-to-the-nearest-10-km-for-conservation-concern> .
 
 <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/SiteCollection/habitat/Closed-forest> a schema:Collection ;
     schema:isPartOf <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000> ;
-    schema:member <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/Site/P0>,
-        <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/Site/P1>,
-        <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/Site/P2>,
-        <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/Site/P3> ;
+    schema:member <https://example.com/site/WAM/P0>,
+        <https://example.com/site/WAM/P1>,
+        <https://linked.data.gov.au/dataset/bdr/site/WAM/P2>,
+        <https://linked.data.gov.au/dataset/bdr/site/WAM/P3> ;
     schema:name "Site Collection - Habitat - Closed forest" ;
     tern:hasAttribute <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/attribute/habitat/Closed-forest> .
 
@@ -57,61 +57,54 @@
 <https://linked.data.gov.au/dataset/bdr/org/WAM> a prov:Agent ;
     schema:name "WAM" .
 
-<https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/Site/P0> a tern:Site ;
+<https://example.com/site/WAM/P0> a tern:Site ;
     geo:hasGeometry _:N9466fd6e9e4c9aa92b83d28000000000 ;
     schema:additionalType <http://linked.data.gov.au/def/tern-cv/5bf7ae21-a454-440b-bdd7-f2fe982d8de4> ;
     schema:description "Footprint of study area" ;
     schema:identifier "P0"^^<https://linked.data.gov.au/dataset/bdr/datatypes/siteID/WAM> ;
-    schema:isPartOf <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000> ;
     schema:name "ParentSite" ;
     tern:featureType <http://linked.data.gov.au/def/tern-cv/5bf7ae21-a454-440b-bdd7-f2fe982d8de4> ;
     tern:locationDescription "Cowaramup Bay Road" .
 
-<https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/Site/P1> a tern:Site ;
+<https://example.com/site/WAM/P1> a tern:Site ;
     geo:hasGeometry _:N3bba75fe5be4a400a5af80dd00000000,
         _:N9466fd6e9e4c9aa92b83d28000000001 ;
     schema:additionalType <http://linked.data.gov.au/def/tern-cv/8cadf069-01d7-4420-b454-cae37740c2a2> ;
     schema:description "Fine woody debris." ;
-    schema:identifier "P1"^^<https://linked.data.gov.au/dataset/bdr/datatypes/siteID/WAM> ;
-    schema:isPartOf <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000>,
-        <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/Site/P0> ;
+    schema:isPartOf <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/Site/P0> ;
     schema:name "Plot 1" ;
     tern:featureType <http://linked.data.gov.au/def/tern-cv/5bf7ae21-a454-440b-bdd7-f2fe982d8de4> ;
     tern:locationDescription "Cowaramup Bay Road" .
 
-<https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/Site/P2> a tern:Site ;
+<https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000> a tern:Dataset .
+
+<https://linked.data.gov.au/dataset/bdr/site/WAM/P2> a tern:Site ;
     geo:hasGeometry _:N3bba75fe5be4a400a5af80dd00000001,
         _:N9466fd6e9e4c9aa92b83d28000000002 ;
     schema:additionalType <http://linked.data.gov.au/def/tern-cv/8cadf069-01d7-4420-b454-cae37740c2a2> ;
     schema:description "Fine woody debris." ;
-    schema:identifier "P2"^^<https://linked.data.gov.au/dataset/bdr/datatypes/siteID/WAM> ;
-    schema:isPartOf <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000> ;
     schema:name "Plot 2" ;
     schema:sameAs "S0" ;
     tern:featureType <http://linked.data.gov.au/def/tern-cv/5bf7ae21-a454-440b-bdd7-f2fe982d8de4> ;
     tern:locationDescription "Cowaramup Bay Road" .
 
-<https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/Site/P3> a tern:Site ;
+<https://linked.data.gov.au/dataset/bdr/site/WAM/P3> a tern:Site ;
     geo:hasGeometry _:N3bba75fe5be4a400a5af80dd00000002,
         _:N9466fd6e9e4c9aa92b83d28000000003 ;
     schema:additionalType <http://linked.data.gov.au/def/tern-cv/8cadf069-01d7-4420-b454-cae37740c2a2> ;
     schema:description "Fine woody debris." ;
-    schema:identifier "P3"^^<https://linked.data.gov.au/dataset/bdr/datatypes/siteID/WAM> ;
-    schema:isPartOf <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000> ;
     schema:name "Plot 3" ;
     schema:sameAs "http://example.com/site/S0"^^xsd:anyURI ;
     tern:featureType <http://linked.data.gov.au/def/tern-cv/5bf7ae21-a454-440b-bdd7-f2fe982d8de4> ;
     tern:locationDescription "Cowaramup Bay Road" .
 
-<https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000> a tern:Dataset .
-
 [] a rdf:Statement ;
     geo:hasGeometry [ a geo:Geometry ;
             geo:asWKT "<http://www.opengis.net/def/crs/EPSG/0/4326> POLYGON ((-33.85 114.98, -33.85 115.01, -33.87 115.01, -33.87 114.98, -33.85 114.98))"^^geo:wktLiteral ;
             geo:hasMetricSpatialAccuracy 5e+01 ] ;
     rdf:object _:N9466fd6e9e4c9aa92b83d28000000000 ;
     rdf:predicate geo:hasGeometry ;
-    rdf:subject <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/Site/P0> ;
+    rdf:subject <https://example.com/site/WAM/P0> ;
     rdfs:comment "supplied as" .
 
 [] a rdf:Statement ;
@@ -120,7 +113,7 @@
             geo:hasMetricSpatialAccuracy 5e+01 ] ;
     rdf:object _:N9466fd6e9e4c9aa92b83d28000000001 ;
     rdf:predicate geo:hasGeometry ;
-    rdf:subject <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/Site/P1> ;
+    rdf:subject <https://example.com/site/WAM/P1> ;
     rdfs:comment "supplied as" .
 
 [] a rdf:Statement ;
@@ -129,7 +122,7 @@
             geo:hasMetricSpatialAccuracy 5e+01 ] ;
     rdf:object _:N9466fd6e9e4c9aa92b83d28000000002 ;
     rdf:predicate geo:hasGeometry ;
-    rdf:subject <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/Site/P2> ;
+    rdf:subject <https://linked.data.gov.au/dataset/bdr/site/WAM/P2> ;
     rdfs:comment "supplied as" .
 
 [] a rdf:Statement ;
@@ -138,7 +131,7 @@
             geo:hasMetricSpatialAccuracy 5e+01 ] ;
     rdf:object _:N9466fd6e9e4c9aa92b83d28000000003 ;
     rdf:predicate geo:hasGeometry ;
-    rdf:subject <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/Site/P3> ;
+    rdf:subject <https://linked.data.gov.au/dataset/bdr/site/WAM/P3> ;
     rdfs:comment "supplied as" .
 
 [] a rdf:Statement ;
@@ -147,7 +140,7 @@
             geo:hasMetricSpatialAccuracy 5e+01 ] ;
     rdf:object _:N3bba75fe5be4a400a5af80dd00000000 ;
     rdf:predicate geo:hasGeometry ;
-    rdf:subject <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/Site/P1> ;
+    rdf:subject <https://example.com/site/WAM/P1> ;
     rdfs:comment "supplied as" .
 
 [] a rdf:Statement ;
@@ -156,7 +149,7 @@
             geo:hasMetricSpatialAccuracy 5e+01 ] ;
     rdf:object _:N3bba75fe5be4a400a5af80dd00000001 ;
     rdf:predicate geo:hasGeometry ;
-    rdf:subject <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/Site/P2> ;
+    rdf:subject <https://linked.data.gov.au/dataset/bdr/site/WAM/P2> ;
     rdfs:comment "supplied as" .
 
 [] a rdf:Statement ;
@@ -165,7 +158,7 @@
             geo:hasMetricSpatialAccuracy 5e+01 ] ;
     rdf:object _:N3bba75fe5be4a400a5af80dd00000002 ;
     rdf:predicate geo:hasGeometry ;
-    rdf:subject <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/Site/P3> ;
+    rdf:subject <https://linked.data.gov.au/dataset/bdr/site/WAM/P3> ;
     rdfs:comment "supplied as" .
 
 _:N3bba75fe5be4a400a5af80dd00000000 a geo:Geometry ;
diff --git a/abis_mapping/templates/survey_site_data_v3/mapping.py b/abis_mapping/templates/survey_site_data_v3/mapping.py
index 7f96d042..130dfed7 100644
--- a/abis_mapping/templates/survey_site_data_v3/mapping.py
+++ b/abis_mapping/templates/survey_site_data_v3/mapping.py
@@ -251,12 +251,20 @@ def apply_mapping_row(
         """
         # TERN.Site subject IRI - Note this needs to match the iri construction of the
         # survey site visit and occurrence template mapping, ensuring they will resolve properly.
+        # If existingBDRSiteIRI is specified, just use that as-is for the IRI.
         site_id: str | None = row["siteID"]
-        site = utils.iri_patterns.site_iri(base_iri, site_id)  # type: ignore[arg-type]  # TODO fix when doing mapping
-
-        # Conditionally create uris dependent on siteIDSource
         site_id_src: str | None = row["siteIDSource"]
-        if site_id_src:
+        existing_site_iri: str | None = row["existingBDRSiteIRI"]
+        if existing_site_iri:
+            site = rdflib.URIRef(existing_site_iri)
+        elif site_id and site_id_src:
+            site = utils.iri_patterns.site_iri(site_id_src, site_id)
+        else:
+            raise ValueError("Invalid row missing SiteID and existingBDRSiteIRI")
+
+        # When both existingBDRSiteIRI and siteID+siteIDSource are provided,
+        # the site gets a schema:identifier with this datatype.
+        if existing_site_iri and site_id and site_id_src:
             site_id_datatype = utils.iri_patterns.datatype_iri("siteID", site_id_src)
             site_id_agent = utils.iri_patterns.agent_iri("org", site_id_src)
             site_id_attribution = utils.iri_patterns.attribution_iri(base_iri, "resourceProvider", site_id_src)
@@ -274,7 +282,7 @@ def apply_mapping_row(
             rtor_site_vocab = self.fields()["relationshipToRelatedSite"].get_vocab()
             if rtor_site_vocab().get(relationship_to_related_site) == rdflib.SDO.isPartOf:
                 # Related site is defined internal to the dataset
-                related_site = utils.iri_patterns.site_iri(base_iri, related_site_id)
+                related_site = utils.iri_patterns.legacy_site_iri(base_iri, related_site_id)
             else:
                 # Related site is defined outside the dataset
                 related_site = utils.rdf.uri_or_string_literal(related_site_id)
@@ -446,7 +454,6 @@ def add_site(
             base_iri: Namespace used to construct IRIs
         """
         # Extract relevant values
-        site_id: str | None = row["siteID"]
         site_name = row["siteName"]
         site_type = row["siteType"]
         site_description = row["siteDescription"]
@@ -455,12 +462,11 @@ def add_site(
         # Add type
         graph.add((uri, a, utils.namespaces.TERN.Site))
 
-        # Add dataset
-        graph.add((uri, rdflib.SDO.isPartOf, dataset))
-
-        # Add siteID
-        dt = site_id_datatype if site_id_datatype is not None else rdflib.XSD.string
-        graph.add((uri, rdflib.SDO.identifier, rdflib.Literal(site_id, datatype=dt)))
+        # Add siteID schema:identifier property, only when both existingBDRSiteIRI
+        # and siteID+siteIDSource are provided.
+        site_id: str | None = row["siteID"]
+        if site_id and site_id_datatype is not None:
+            graph.add((uri, rdflib.SDO.identifier, rdflib.Literal(site_id, datatype=site_id_datatype)))
 
         # Add related site if provided
         if related_site is not None and (relationship_to_related_site := row["relationshipToRelatedSite"]):
diff --git a/abis_mapping/templates/survey_site_visit_data_v2/mapping.py b/abis_mapping/templates/survey_site_visit_data_v2/mapping.py
index d2c46610..ce0b9934 100644
--- a/abis_mapping/templates/survey_site_visit_data_v2/mapping.py
+++ b/abis_mapping/templates/survey_site_visit_data_v2/mapping.py
@@ -237,7 +237,7 @@ def apply_mapping_row(
 
         # TERN.Site subject IRI - Note this needs to match the iri construction of the
         # survey site and occurrence template mapping, ensuring they will resolve properly.
-        uri_site = utils.iri_patterns.site_iri(base_iri, row_site_id)
+        uri_site = utils.iri_patterns.legacy_site_iri(base_iri, row_site_id)
 
         # Create TERN survey IRI from surveyID field
         row_survey_id: str | None = row["surveyID"]
diff --git a/abis_mapping/templates/survey_site_visit_data_v3/examples/minimal.csv b/abis_mapping/templates/survey_site_visit_data_v3/examples/minimal.csv
index 54e16c72..47d62d40 100644
--- a/abis_mapping/templates/survey_site_visit_data_v3/examples/minimal.csv
+++ b/abis_mapping/templates/survey_site_visit_data_v3/examples/minimal.csv
@@ -1,4 +1,4 @@
 surveyID,siteID,siteIDSource,existingBDRSiteIRI,siteVisitID,siteVisitStart,siteVisitEnd,visitOrgs,visitObservers,condition,targetTaxonomicScope,protocolName,protocolDescription,samplingEffortValue,samplingEffortUnit
-TIS-24-03,P1,WAM,,TIS-24-03-P1-01,2024-03-12,2024-04-04,WAM | DBCA,ORCID00001 | ORCID00002,dry,new_taxon,wet pitfall trap,10 x square buckets of size 20 x 20 x 15 cm. Propylene glycol.,240,trap nights
-TIS-24-03,P1,WAM,,TIS-24-03-P1-02,2024-03-12,2024-03-12,WAM,ORCID00001,moist leaf litter after recent rain,invertebrate,litter sifting,50 cm diameter sifter with 5 mm mesh. Litter samles taken ~1 metre from each pitfall trap,10,sifts
-TIS-24-03,P1,WAM,,TIS-24-03-P1-03,2024-03-12,,WAM,ORCID00003,,bird,human observation,,,
+TIS-24-03,P1,WAM,https://example.com/site/P1,TIS-24-03-P1-01,2024-03-12,2024-04-04,WAM | DBCA,ORCID00001 | ORCID00002,dry,new_taxon,wet pitfall trap,10 x square buckets of size 20 x 20 x 15 cm. Propylene glycol.,240,trap nights
+TIS-24-03,,,https://example.com/site/P2,TIS-24-03-P2-01,2024-03-12,2024-03-12,WAM,ORCID00001,moist leaf litter after recent rain,invertebrate,litter sifting,50 cm diameter sifter with 5 mm mesh. Litter samles taken ~1 metre from each pitfall trap,10,sifts
+TIS-24-03,P3,WAM,,TIS-24-03-P3-01,2024-03-12,,WAM,ORCID00003,,bird,human observation,,,
diff --git a/abis_mapping/templates/survey_site_visit_data_v3/examples/minimal.ttl b/abis_mapping/templates/survey_site_visit_data_v3/examples/minimal.ttl
index 2b840065..b5ce687c 100644
--- a/abis_mapping/templates/survey_site_visit_data_v3/examples/minimal.ttl
+++ b/abis_mapping/templates/survey_site_visit_data_v3/examples/minimal.ttl
@@ -10,7 +10,7 @@
 
 <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/SiteVisitCollection/samplingEffort/10-sifts> a schema:Collection ;
     schema:isPartOf <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000> ;
-    schema:member <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/SiteVisit/TIS-24-03-P1-02> ;
+    schema:member <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/SiteVisit/TIS-24-03-P2-01> ;
     schema:name "Site Visit Collection - Sampling Effort - 10 sifts" ;
     tern:hasAttribute <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/attribute/samplingEffort/10-sifts> .
 
@@ -22,13 +22,13 @@
 
 <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/SiteVisitCollection/targetTaxonomicScope/bird> a schema:Collection ;
     schema:isPartOf <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000> ;
-    schema:member <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/SiteVisit/TIS-24-03-P1-03> ;
+    schema:member <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/SiteVisit/TIS-24-03-P3-01> ;
     schema:name "Site Visit Collection - Target Taxonomic Scope - bird" ;
     tern:hasAttribute <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/attribute/targetTaxonomicScope/bird> .
 
 <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/SiteVisitCollection/targetTaxonomicScope/invertebrate> a schema:Collection ;
     schema:isPartOf <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000> ;
-    schema:member <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/SiteVisit/TIS-24-03-P1-02> ;
+    schema:member <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/SiteVisit/TIS-24-03-P2-01> ;
     schema:name "Site Visit Collection - Target Taxonomic Scope - invertebrate" ;
     tern:hasAttribute <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/attribute/targetTaxonomicScope/invertebrate> .
 
@@ -43,17 +43,22 @@
     skos:prefLabel "WAM Site ID" ;
     prov:qualifiedAttribution <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/attribution/WAM/resourceProvider> .
 
-<https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/SiteVisit/TIS-24-03-P1-03> a tern:SiteVisit ;
+<https://example.com/site/P1> a tern:Site ;
+    schema:identifier "P1"^^<https://linked.data.gov.au/dataset/bdr/datatypes/siteID/WAM> .
+
+<https://example.com/site/P2> a tern:Site .
+
+<https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/SiteVisit/TIS-24-03-P3-01> a tern:SiteVisit ;
     time:hasTime [ a time:TemporalEntity ;
             time:hasBeginning [ a time:Instant ;
                     time:inXSDDate "2024-03-12"^^xsd:date ] ] ;
-    prov:hadPlan <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/visit/plan/TIS-24-03-P1-03> ;
+    prov:hadPlan <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/visit/plan/TIS-24-03-P3-01> ;
     prov:wasAssociatedWith <https://linked.data.gov.au/dataset/bdr/org/WAM>,
         <https://linked.data.gov.au/dataset/bdr/person/ORCID00003> ;
-    schema:identifier "TIS-24-03-P1-03" ;
+    schema:identifier "TIS-24-03-P3-01" ;
     schema:isPartOf <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000>,
         <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/Survey/TIS-24-03> ;
-    tern:hasSite <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/Site/P1> .
+    tern:hasSite <https://linked.data.gov.au/dataset/bdr/site/WAM/P3> .
 
 <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/attribute/samplingEffort/10-sifts> a tern:Attribute ;
     schema:isPartOf <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000> ;
@@ -136,12 +141,12 @@
     schema:description "10 x square buckets of size 20 x 20 x 15 cm. Propylene glycol." ;
     schema:isPartOf <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000> .
 
-<https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/visit/plan/TIS-24-03-P1-02> a prov:Plan ;
+<https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/visit/plan/TIS-24-03-P2-01> a prov:Plan ;
     sosa:usedProcedure <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/bdr-cv/attribute/protocolName/litter-sifting> ;
     schema:description "50 cm diameter sifter with 5 mm mesh. Litter samles taken ~1 metre from each pitfall trap" ;
     schema:isPartOf <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000> .
 
-<https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/visit/plan/TIS-24-03-P1-03> a prov:Plan ;
+<https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/visit/plan/TIS-24-03-P3-01> a prov:Plan ;
     sosa:usedProcedure <http://linked.data.gov.au/def/tern-cv/ea1d6342-1901-4f88-8482-3111286ec157> ;
     schema:isPartOf <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000> .
 
@@ -157,6 +162,8 @@
         prov:Person ;
     schema:name "ORCID00003" .
 
+<https://linked.data.gov.au/dataset/bdr/site/WAM/P3> a tern:Site .
+
 <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/SiteVisit/TIS-24-03-P1-01> a tern:SiteVisit ;
     time:hasTime [ a time:TemporalEntity ;
             time:hasBeginning [ a time:Instant ;
@@ -171,32 +178,28 @@
     schema:identifier "TIS-24-03-P1-01" ;
     schema:isPartOf <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000>,
         <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/Survey/TIS-24-03> ;
-    tern:hasSite <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/Site/P1> ;
+    tern:hasSite <https://example.com/site/P1> ;
     tern:siteDescription "dry" .
 
-<https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/SiteVisit/TIS-24-03-P1-02> a tern:SiteVisit ;
+<https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/SiteVisit/TIS-24-03-P2-01> a tern:SiteVisit ;
     time:hasTime [ a time:TemporalEntity ;
             time:hasBeginning [ a time:Instant ;
                     time:inXSDDate "2024-03-12"^^xsd:date ] ;
             time:hasEnd [ a time:Instant ;
                     time:inXSDDate "2024-03-12"^^xsd:date ] ] ;
-    prov:hadPlan <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/visit/plan/TIS-24-03-P1-02> ;
+    prov:hadPlan <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/visit/plan/TIS-24-03-P2-01> ;
     prov:wasAssociatedWith <https://linked.data.gov.au/dataset/bdr/org/WAM>,
         <https://linked.data.gov.au/dataset/bdr/person/ORCID00001> ;
-    schema:identifier "TIS-24-03-P1-02" ;
+    schema:identifier "TIS-24-03-P2-01" ;
     schema:isPartOf <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000>,
         <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/Survey/TIS-24-03> ;
-    tern:hasSite <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/Site/P1> ;
+    tern:hasSite <https://example.com/site/P2> ;
     tern:siteDescription "moist leaf litter after recent rain" .
 
 <https://linked.data.gov.au/dataset/bdr/person/ORCID00001> a prov:Agent,
         prov:Person ;
     schema:name "ORCID00001" .
 
-<https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/Site/P1> a tern:Site ;
-    schema:identifier "P1"^^<https://linked.data.gov.au/dataset/bdr/datatypes/siteID/WAM> ;
-    schema:isPartOf <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000> .
-
 <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000/Survey/TIS-24-03> a tern:Survey ;
     schema:isPartOf <https://linked.data.gov.au/dataset/bdr/00000000-0000-0000-0000-000000000000> .
 
diff --git a/abis_mapping/templates/survey_site_visit_data_v3/mapping.py b/abis_mapping/templates/survey_site_visit_data_v3/mapping.py
index 295ac4d0..1e378089 100644
--- a/abis_mapping/templates/survey_site_visit_data_v3/mapping.py
+++ b/abis_mapping/templates/survey_site_visit_data_v3/mapping.py
@@ -243,12 +243,9 @@ def apply_mapping_row(
         # variables starting with uri_ are constructed URIs.
 
         row_site_visit_id: str | None = row["siteVisitID"]
-        row_site_id: str | None = row["siteID"]
         # should always have these mandatory fields, skip if not
         if not row_site_visit_id:
             return
-        if not row_site_id:
-            return
 
         # Part 1: Construct URIs from Row
 
@@ -258,7 +255,16 @@ def apply_mapping_row(
 
         # TERN.Site subject IRI - Note this needs to match the iri construction of the
         # survey site and occurrence template mapping, ensuring they will resolve properly.
-        uri_site = utils.iri_patterns.site_iri(base_iri, row_site_id)
+        # If existingBDRSiteIRI is specified, just use that as-is for the IRI.
+        row_site_id: str | None = row["siteID"]
+        row_site_id_source: str | None = row["siteIDSource"]
+        row_existing_site_iri: str | None = row["existingBDRSiteIRI"]
+        if row_existing_site_iri:
+            uri_site = rdflib.URIRef(row_existing_site_iri)
+        elif row_site_id and row_site_id_source:
+            uri_site = utils.iri_patterns.site_iri(row_site_id_source, row_site_id)
+        else:
+            raise ValueError("Invalid row missing SiteID and existingBDRSiteIRI")
 
         # Create TERN survey IRI from surveyID field
         row_survey_id: str = row["surveyID"]
@@ -267,9 +273,9 @@ def apply_mapping_row(
         # URI for the Site Visit Plan
         uri_site_visit_plan = utils.iri_patterns.plan_iri(base_iri, "visit", row_site_visit_id)
 
-        # URIs based on the siteIDSource
-        row_site_id_source: str | None = row["siteIDSource"]
-        if row_site_id_source:
+        # When both existingBDRSiteIRI and siteID+siteIDSource are provided,
+        # the site gets a schema:identifier with this datatype.
+        if row_existing_site_iri and row_site_id and row_site_id_source:
             uri_site_id_datatype = utils.iri_patterns.datatype_iri("siteID", row_site_id_source)
             uri_site_id_datatype_attribution = utils.iri_patterns.attribution_iri(
                 base_iri, "resourceProvider", row_site_id_source
@@ -372,7 +378,6 @@ def apply_mapping_row(
         self.add_site(
             uri=uri_site,
             uri_site_id_datatype=uri_site_id_datatype,
-            dataset=dataset,
             row=row,
             graph=graph,
         )
@@ -560,7 +565,6 @@ def add_site(
         *,
         uri: rdflib.URIRef,
         uri_site_id_datatype: rdflib.URIRef | None,
-        dataset: rdflib.URIRef,
         row: frictionless.Row,
         graph: rdflib.Graph,
     ) -> None:
@@ -576,12 +580,11 @@ def add_site(
         # Add class
         graph.add((uri, a, utils.namespaces.TERN.Site))
 
-        # Add siteID literal
-        dt = uri_site_id_datatype or rdflib.XSD.string
-        graph.add((uri, rdflib.SDO.identifier, rdflib.Literal(row["siteID"], datatype=dt)))
-
-        # Add to dataset
-        graph.add((uri, rdflib.SDO.isPartOf, dataset))
+        # Add siteID schema:identifier property, only when both existingBDRSiteIRI
+        # and siteID+siteIDSource are provided.
+        row_site_id: str | None = row["siteID"]
+        if row_site_id and uri_site_id_datatype is not None:
+            graph.add((uri, rdflib.SDO.identifier, rdflib.Literal(row_site_id, datatype=uri_site_id_datatype)))
 
     def add_site_id_datatype(
         self,
diff --git a/abis_mapping/utils/iri_patterns.py b/abis_mapping/utils/iri_patterns.py
index 39b21b52..65714f99 100644
--- a/abis_mapping/utils/iri_patterns.py
+++ b/abis_mapping/utils/iri_patterns.py
@@ -41,13 +41,16 @@ def survey_iri(
     )
 
 
-def site_iri(
+# TODO: Remove once SSD v2 is removed.
+def legacy_site_iri(
     base_iri: rdflib.Namespace,
     site_id: str,
     /,
 ) -> rdflib.URIRef:
     """Get the IRI for the tern:Site node, constructed from the siteID field.
 
+    # NOTE this pattern is deprecated, is no longer used from SSD v3 onwards.
+
     This IRI is used in mapping multiple Systematic Survey template,
     and needs to be the same for all of them.
 
@@ -61,6 +64,31 @@ def site_iri(
     return utils.rdf.uri_quoted(base_iri, "Site/{site_id}", site_id=site_id)
 
 
+def site_iri(
+    site_id_source: str,
+    site_id: str,
+    /,
+) -> rdflib.URIRef:
+    """Get the IRI for the tern:Site node, constructed from the siteID+siteIDSource fields.
+
+    This IRI is used in mapping multiple Systematic Survey template,
+    and needs to be the same for all of them.
+
+    Args:
+        site_id: The siteID field from the template.
+        site_id_source: The siteIDSource field from the template.
+
+    Returns:
+        The IRI for the tern:Survey node.
+    """
+    return utils.rdf.uri_quoted(
+        utils.namespaces.DATASET_BDR,
+        "site/{site_id_source}/{site_id}",
+        site_id_source=site_id_source,
+        site_id=site_id,
+    )
+
+
 def site_visit_iri(
     base_iri: rdflib.Namespace,
     site_visit_id: str,