diff --git a/cdr_schemas/georeference.py b/cdr_schemas/georeference.py
index e6c5460..19a281a 100644
--- a/cdr_schemas/georeference.py
+++ b/cdr_schemas/georeference.py
@@ -30,7 +30,7 @@ class Pixel_Point(BaseModel):
 
 
 class Map_Area(BaseModel):
-    coordinates: List[List[Union[float, int]]]
+    coordinates: List[List[List[Union[float, int]]]]
     type: GeomType = GeomType.Polygon