diff --git a/google/cloud/aiplatform/constants/base.py b/google/cloud/aiplatform/constants/base.py
index 5e09fce1d0..230918d564 100644
--- a/google/cloud/aiplatform/constants/base.py
+++ b/google/cloud/aiplatform/constants/base.py
@@ -36,6 +36,8 @@
     "us-east4",
     "us-west1",
     "us-west2",
+    "us-west4",
+    "southamerica-east1",
 }
 
 API_BASE_PATH = "aiplatform.googleapis.com"
diff --git a/tests/unit/aiplatform/test_utils.py b/tests/unit/aiplatform/test_utils.py
index b47eb684d8..8308b04cca 100644
--- a/tests/unit/aiplatform/test_utils.py
+++ b/tests/unit/aiplatform/test_utils.py
@@ -42,7 +42,7 @@
 
 def test_invalid_region_raises_with_invalid_region():
     with pytest.raises(ValueError):
-        aiplatform.utils.validate_region(region="us-west4")
+        aiplatform.utils.validate_region(region="us-west3")
 
 
 def test_invalid_region_does_not_raise_with_valid_region():