diff --git a/moto/pinpoint/models.py b/moto/pinpoint/models.py
index 69053ce476dd..a482a783a7c1 100644
--- a/moto/pinpoint/models.py
+++ b/moto/pinpoint/models.py
@@ -14,7 +14,7 @@
 class App(BaseModel):
     def __init__(self, account_id: str, region_name: str, name: str):
         self.application_id = str(mock_random.uuid4()).replace("-", "")
-        self.arn = f"arn:{get_partition(region_name)}:mobiletargeting:us-east-1:{account_id}:apps/{self.application_id}"
+        self.arn = f"arn:{get_partition(region_name)}:mobiletargeting:{region_name}:{account_id}:apps/{self.application_id}"
         self.name = name
         self.created = unix_time()
         self.settings = AppSettings()
diff --git a/tests/test_pinpoint/test_pinpoint.py b/tests/test_pinpoint/test_pinpoint.py
index bdf4cc042e8d..adea2e753b29 100644
--- a/tests/test_pinpoint/test_pinpoint.py
+++ b/tests/test_pinpoint/test_pinpoint.py
@@ -17,6 +17,7 @@ def test_create_app():
 
     assert "ApplicationResponse" in resp
     assert "Arn" in resp["ApplicationResponse"]
+    assert "us-east-1" in resp["ApplicationResponse"]["Arn"]
     assert "Id" in resp["ApplicationResponse"]
     assert resp["ApplicationResponse"]["Name"] == "myfirstapp"
     assert "CreationDate" in resp["ApplicationResponse"]
@@ -50,6 +51,7 @@ def test_get_app():
 
     assert "ApplicationResponse" in resp
     assert "Arn" in resp["ApplicationResponse"]
+    assert "eu-west-1" in resp["ApplicationResponse"]["Arn"]
     assert "Id" in resp["ApplicationResponse"]
     assert resp["ApplicationResponse"]["Name"] == "myfirstapp"
     assert "CreationDate" in resp["ApplicationResponse"]