diff --git a/cid/base.py b/cid/base.py
index d14f9570..590d2d1d 100644
--- a/cid/base.py
+++ b/cid/base.py
@@ -23,7 +23,9 @@ def account_id(self) -> str:
 
     @property
     def domain(self) -> str:
-        if self.region.startswith('cn-'):
+        if self.partition == 'aws-us-gov':
+            return 'amazonaws-us-gov.com'
+        if self.partition == 'aws-cn':
             return 'amazonaws.cn'
         return 'aws.amazon.com'