diff --git a/awslogs/core.py b/awslogs/core.py
index 8af6a0e..b471679 100644
--- a/awslogs/core.py
+++ b/awslogs/core.py
@@ -33,6 +33,10 @@ def milis2iso(milis):
 
 def boto3_client(aws_profile, aws_access_key_id, aws_secret_access_key, aws_session_token, aws_region):
     core_session = botocore.session.get_session()
+    known_regions = core_session.get_available_regions('logs')
+    if aws_region is not None:
+        if aws_region not in known_regions:
+            print("WARNING: your selected region {REGION} is probably not valid".format(REGION=aws_region))
     core_session.set_config_variable('profile', aws_profile)
 
     credential_provider = core_session.get_component('credential_provider').get_provider('assume-role')
@@ -103,9 +107,9 @@ def list_logs(self):
             streams = list(self._get_streams_from_pattern(self.log_group_name, self.log_stream_name))
             if len(streams) > self.FILTER_LOG_EVENTS_STREAMS_LIMIT:
                 raise exceptions.TooManyStreamsFilteredError(
-                     self.log_stream_name,
-                     len(streams),
-                     self.FILTER_LOG_EVENTS_STREAMS_LIMIT
+                    self.log_stream_name,
+                    len(streams),
+                    self.FILTER_LOG_EVENTS_STREAMS_LIMIT
                 )
             if len(streams) == 0:
                 raise exceptions.NoStreamsFilteredError(self.log_stream_name)
diff --git a/tests/test_it.py b/tests/test_it.py
index b54f30d..43fd2e6 100644
--- a/tests/test_it.py
+++ b/tests/test_it.py
@@ -399,8 +399,8 @@ def test_get_nogroup_nostream_short_forms(self, mock_stdout, botoclient):
     def test_get_timestamp(self, mock_stdout, botoclient):
         self.set_ABCDE_logs(botoclient)
         exit_code = main("awslogs get "
-             "--timestamp --no-group --no-stream "
-             "AAA DDD --color=never".split())
+                         "--timestamp --no-group --no-stream "
+                         "AAA DDD --color=never".split())
 
         self.assertEqual(
             mock_stdout.getvalue(),
@@ -418,8 +418,8 @@ def test_get_timestamp(self, mock_stdout, botoclient):
     def test_get_ingestion_time(self, mock_stdout, botoclient):
         self.set_ABCDE_logs(botoclient)
         exit_code = main("awslogs get "
-             "--ingestion-time --no-group --no-stream "
-             "AAA DDD --color=never".split())
+                         "--ingestion-time --no-group --no-stream "
+                         "AAA DDD --color=never".split())
 
         self.assertEqual(
             mock_stdout.getvalue(),
@@ -437,8 +437,8 @@ def test_get_ingestion_time(self, mock_stdout, botoclient):
     def test_get_timestamp_and_ingestion_time(self, mock_stdout, botoclient):
         self.set_ABCDE_logs(botoclient)
         exit_code = main("awslogs get "
-             "--timestamp --ingestion-time --no-group --no-stream "
-             "AAA DDD --color=never".split())
+                         "--timestamp --ingestion-time --no-group --no-stream "
+                         "AAA DDD --color=never".split())
 
         self.assertEqual(
             mock_stdout.getvalue(),
@@ -630,3 +630,14 @@ def test_boto3_client_creation(self, mock_core_session):
 
         awslogs = AWSLogs()
         self.assertEqual(client, awslogs.client)
+
+    @patch('botocore.session.get_session')
+    def test_boto3_client_invalid_region(self, mock_core_session):
+        client = Mock()
+        boto_session = Mock()
+        mock_core_session.return_value = boto_session
+        boto_session.create_client.return_value = client
+        boto_session.aws_region.return_value = "Frankfurt"
+
+        awslogs = AWSLogs()
+        self.assertEqual(client, awslogs.client)