diff --git a/apps/api/app/community_review.py b/apps/api/app/community_review.py
index d580652..ab19691 100644
--- a/apps/api/app/community_review.py
+++ b/apps/api/app/community_review.py
@@ -21,7 +21,7 @@ class ExternalReviewError(ValueError):
 
 def map_observation(
     session: Session, observation: ExternalObservation, fish: Fish, waterbody: Waterbody,
-    *, note: str | None = None,
+    *, note: str | None = None, commit: bool = True,
 ) -> ExternalObservation:
     if observation.status == "published":
         raise ExternalReviewError("published observation cannot be remapped")
@@ -43,7 +43,8 @@ def map_observation(
     observation.status = "ready" if _complete(observation) else "mapped"
     _save_alias(session, observation, "fish", observation.fish_external_id or observation.fish_name, fish=fish)
     _save_alias(session, observation, "waterbody", observation.waterbody_external_id or observation.waterbody_name, waterbody=waterbody)
-    session.commit()
+    if commit:
+        session.commit()
     return observation
 
 
diff --git a/apps/api/app/routers/admin.py b/apps/api/app/routers/admin.py
index 9473577..f8b00cf 100644
--- a/apps/api/app/routers/admin.py
+++ b/apps/api/app/routers/admin.py
@@ -20,7 +20,7 @@ from rf4_research.media_assets import publish_quality_upgrades, rollback_quality
 from ..media_catalog import MEDIA_ROOT, review_assets, review_file
 from ..models import CatchReport, CommunityImportRun, DataSource, ExternalObservation, Fish, ModerationEvent, ModerationStatus, OfficialRecordImport, SourceType, Waterbody
 from ..public_cache import public_cache
-from ..schemas import AdminCatchReportOut, AdminMediaDecision, AdminMediaReviewOut, AdminMediaRollback, AdminModerationHistoryOut, AdminSourceStatusOut, CatchReportCreated, ExternalAliasSuggestionOut, ExternalObservationAction, ExternalObservationBulkDecision, ExternalObservationBulkResult, ExternalObservationDecision, ExternalObservationMapping, ExternalObservationOut, ExternalObservationPublished, ImportRunOut, ModerationBulkResult, ModerationBulkUpdate, ModerationUpdate
+from ..schemas import AdminCatchReportOut, AdminMediaDecision, AdminMediaReviewOut, AdminMediaRollback, AdminModerationHistoryOut, AdminSourceStatusOut, CatchReportCreated, ExternalAliasSuggestionOut, ExternalObservationAction, ExternalObservationBulkDecision, ExternalObservationBulkMapping, ExternalObservationBulkResult, ExternalObservationDecision, ExternalObservationMapping, ExternalObservationOut, ExternalObservationPublished, ImportRunOut, ModerationBulkResult, ModerationBulkUpdate, ModerationUpdate
 from ..storage import delete_screenshot, signed_screenshot_url
 from ..time_utils import aware
 
@@ -343,6 +343,34 @@ def admin_map_external_observation(
         raise HTTPException(status_code=409, detail=str(exc)) from exc
 
 
+@router.patch("/api/v1/admin/external-observations/bulk-mapping", response_model=ExternalObservationBulkResult)
+def admin_map_external_observations_bulk(
+    payload: ExternalObservationBulkMapping, db: Db, _: Annotated[str, Depends(_admin)],
+) -> ExternalObservationBulkResult:
+    ids = [item.id for item in payload.items]
+    observations = list(db.scalars(select(ExternalObservation).where(ExternalObservation.id.in_(ids)).with_for_update()))
+    by_id = {item.id: item for item in observations}
+    expected = {item.id: item.expected_version for item in payload.items}
+    if len(by_id) != len(ids) or any(
+        item.status in {"published", "withdrawn"} or item.moderation_version != expected[item.id]
+        for item in observations
+    ):
+        raise HTTPException(status_code=409, detail="one or more observations changed; reload the queue")
+    fish = db.scalar(select(Fish).where(Fish.slug == payload.fish_slug))
+    waterbody = db.scalar(select(Waterbody).where(Waterbody.slug == payload.waterbody_slug))
+    if fish is None or waterbody is None:
+        raise HTTPException(status_code=422, detail="unknown fish or waterbody")
+    try:
+        for item in observations:
+            item.moderation_version += 1
+            map_observation(db, item, fish, waterbody, note=payload.note, commit=False)
+        db.commit()
+    except ExternalReviewError as exc:
+        db.rollback()
+        raise HTTPException(status_code=409, detail=str(exc)) from exc
+    return ExternalObservationBulkResult(updated=len(observations))
+
+
 @router.post("/api/v1/admin/external-observations/{observation_id}/publish", response_model=ExternalObservationPublished)
 def admin_publish_external_observation(
     observation_id: UUID, payload: ExternalObservationAction, db: Db, _: Annotated[str, Depends(_admin)],
diff --git a/apps/api/app/schemas.py b/apps/api/app/schemas.py
index cd3988b..99d38b0 100644
--- a/apps/api/app/schemas.py
+++ b/apps/api/app/schemas.py
@@ -413,6 +413,13 @@ class ExternalObservationBulkDecision(BaseModel):
     items: list[ExternalObservationBulkItem] = Field(min_length=1, max_length=50)
 
 
+class ExternalObservationBulkMapping(BaseModel):
+    fish_slug: str
+    waterbody_slug: str
+    note: str | None = Field(default=None, max_length=1000)
+    items: list[ExternalObservationBulkItem] = Field(min_length=1, max_length=50)
+
+
 class ExternalObservationBulkResult(BaseModel):
     updated: int