diff --git a/regional_mom6/regional_mom6.py b/regional_mom6/regional_mom6.py
index 02fecafe..83fa9c68 100644
--- a/regional_mom6/regional_mom6.py
+++ b/regional_mom6/regional_mom6.py
@@ -925,8 +925,8 @@ def setup_bathymetry(
         self,
         *,
         bathymetry_path,
-        longitude_coordinate_name="lat",
-        latitude_coordinate_name="lon",
+        longitude_coordinate_name="lon",
+        latitude_coordinate_name="lat",
         vertical_coordinate_name="elevation",
         fill_channels=False,
         minimum_layers=3,