The
St. Marys River (named
Saint Marys River by the
USGS, and sometimes misspelled as
St. Mary's River) is a river in the southeastern
United States. It is named after the Irish Saint Mary. From near its source in the
Okefenokee Swamp, to its mouth at the
Atlantic Ocean, it forms a portion of the
border between the
U.S. states of
Georgia and
Florida. The river also serves as the southernmost point in the state of Georgia.