diff --git a/backend/geonature/core/gn_synthese/routes.py b/backend/geonature/core/gn_synthese/routes.py
index 851cd8868d..83dec1de76 100644
--- a/backend/geonature/core/gn_synthese/routes.py
+++ b/backend/geonature/core/gn_synthese/routes.py
@@ -145,6 +145,7 @@ def build_blurred_precise_geom_queries(filters, where_clauses: list = []):
     # - priority is used to prevail non blurred geom over blurred geom if the user
     #   can access to the non blurred geom
     # - orderby needed to match the non blurred and the blurred observations
+    areas_srid = DB.session.execute(func.Find_SRID("ref_geo", "l_areas", "geom")).scalar()
     blurred_geom_query = SyntheseQuery(
         Synthese,
         select(
@@ -166,6 +167,8 @@ def build_blurred_precise_geom_queries(filters, where_clauses: list = []):
             CorAreaSyntheseAlias,
             CorAreaSyntheseAlias.id_synthese == Synthese.id_synthese,
         ),
+        geom_column=LAreas.geom,
+        geom_column_srid=areas_srid,
     )
     # Joins here are needed to retrieve the blurred geometry
     blurred_geom_query.add_join(LAreas, LAreas.id_area, CorAreaSyntheseAlias.id_area)
diff --git a/backend/geonature/core/gn_synthese/utils/query_select_sqla.py b/backend/geonature/core/gn_synthese/utils/query_select_sqla.py
index ad48d2d2fe..1a248b32af 100644
--- a/backend/geonature/core/gn_synthese/utils/query_select_sqla.py
+++ b/backend/geonature/core/gn_synthese/utils/query_select_sqla.py
@@ -18,6 +18,8 @@
 from werkzeug.exceptions import BadRequest
 from shapely.geometry import shape
 from geoalchemy2.shape import from_shape
+from pyproj import CRS, Transformer
+from shapely.ops import transform
 
 from geonature.utils.env import DB
 from geonature.core.gn_synthese.models import (
@@ -70,6 +72,7 @@ def __init__(
         with_generic_table=False,
         query_joins=None,
         geom_column=None,
+        geom_column_srid=4326,
     ):
         self.query = query
 
@@ -79,6 +82,7 @@ def __init__(
         self._already_joined_table = []
         self.query_joins = query_joins
         self.geom_column = geom_column if geom_column is not None else model.the_geom_4326
+        self.geom_column_srid = geom_column_srid
 
         if with_generic_table:
             model_temp = model.columns
@@ -419,7 +423,15 @@ def filter_other_filters(self, user):
                 raise BadRequest("Unsupported geoIntersection type")
             geo_filters = []
             for feature in features:
-                geom_wkb = from_shape(shape(feature["geometry"]), srid=4326)
+                geom_4326 = shape(feature["geometry"])
+                if self.geom_column_srid != 4326:
+                    projection = Transformer.from_crs(
+                        CRS(4326), CRS(self.geom_column_srid), always_xy=True
+                    )
+                    geom_correct_srid = transform(projection.transform, geom_4326)
+                else:
+                    geom_correct_srid = geom_4326
+                geom_wkb = from_shape(geom_correct_srid, srid=self.geom_column_srid)
                 # if the geom is a circle
                 if "radius" in feature["properties"]:
                     radius = feature["properties"]["radius"]