diff --git a/Assets/Scripts/AnnotationPass/CityFieldsPass.cs b/Assets/Scripts/AnnotationPass/CityFieldsPass.cs
index c39e84c..a9a4787 100644
--- a/Assets/Scripts/AnnotationPass/CityFieldsPass.cs
+++ b/Assets/Scripts/AnnotationPass/CityFieldsPass.cs
@@ -97,6 +97,9 @@ namespace Assets.AnnotationPass
                 
                 city.Fields.Add(CreateField(a, b));
             }
+
+            // remove outside field
+            city.Fields.Remove(city.Fields.OrderByDescending(field => field.Boundary.Count).First());
         }
 
         public void Annotate(Map map)