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Bay of Saint Louis

Bay of Saint Louis
Location Southwest coast of Mississippi
Coordinates 30°20′49″N 89°19′01″W / 30.347°N 89.317°W / 30.347; -89.317Coordinates: 30°20′49″N 89°19′01″W / 30.347°N 89.317°W / 30.347; -89.317
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 Saint Louis (Bay of St. Louis, St. Louis Bay) is a shallow-water, partially enclosed estuary of the northeast Gulf of Mexico along the southwestern coast of Mississippi. The estuary receives freshwater input from two blackwater, or swamp-land, tributaries of the Mississippi River, the Jourdan River on the west and the Wolf River on the east and some smaller streams (Bayou Portage); these are mixed in the bay with salt water from Mississippi Sound and the Mississippi Bight. The waters are comparatively well mixed, with an average salinity of less than 20.United States Environmental Protection Agency due



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