diff --git a/src/openeo_gfmap/utils/catalogue.py b/src/openeo_gfmap/utils/catalogue.py
index 8199de1..d20648b 100644
--- a/src/openeo_gfmap/utils/catalogue.py
+++ b/src/openeo_gfmap/utils/catalogue.py
@@ -1,7 +1,6 @@
 """Functionalities to interract with product catalogues."""
-
+import geojson
 import requests
-from geojson import GeoJSON
 from pyproj.crs import CRS
 from rasterio.warp import transform_bounds
 from shapely import unary_union
@@ -131,10 +130,14 @@ def s1_area_per_orbitstate(
         Keys containing the orbit state and values containing the total area of intersection in
         km^2
     """
-    if isinstance(spatial_extent, GeoJSON):
+    if isinstance(spatial_extent, geojson.FeatureCollection):
         # Transform geojson into shapely geometry and compute bounds
-        bounds = shape(spatial_extent).bounds
-        epsg = 4362
+        shapely_geometries = [
+            shape(feature["geometry"]) for feature in spatial_extent["features"]
+        ]
+        geometry = unary_union(shapely_geometries)
+        bounds = geometry.bounds
+        epsg = 4326
     elif isinstance(spatial_extent, BoundingBoxExtent):
         bounds = [
             spatial_extent.west,