Bay of St. Louis
| Bay of St. Louis | |
|---|---|
| Location | Southwest coast of Mississippi |
| Coordinates | 30°20′49″N 89°19′01″W / 30.347°N 89.317°W |
| Type | Estuary |
| River sources | Jourdan River Wolf River |
| Basin countries | United States |
| Average depth | 1.5 m (4 ft 11 in) |
| Salinity | <20 (average) |
| Settlements | Pass Christian Bay St. Louis Diamondhead |
The Bay of St. Louis (St. Louis Bay; French: Baie Saint-Louis) is a shallow-water, partially enclosed estuary of the northeast Gulf of Mexico along the southwestern coast of Mississippi.