diff --git a/libs/langchain/langchain/llms/bedrock.py b/libs/langchain/langchain/llms/bedrock.py
index acc977a0a9c..020847fcce5 100644
--- a/libs/langchain/langchain/llms/bedrock.py
+++ b/libs/langchain/langchain/llms/bedrock.py
@@ -204,7 +204,7 @@ class BedrockBase(BaseModel, ABC):
                 values,
                 "region_name",
                 "AWS_DEFAULT_REGION",
-                default=None,
+                default=session.region_name,
             )
 
             client_params = {}