St. Marys River | |
---|---|
Country | United States |
State | Maryland |
County | St. Mary's County |
Basin features | |
River mouth |
Potomac River 0 feet (0 m) |
Physical characteristics | |
Length | 22.3 miles (35.9 km) |
The St. Marys River (sometimes spelled St. Mary's River) is a 22.3-mile-long (35.9 km) river in southern Maryland in the United States. It rises in southern St. Mary's County, and flows to the southeast through Great Mills, widening into a tidal estuary near St. Marys City, approximately 2 miles (3 km) wide at its mouth on the north bank of the Potomac River, near the Chesapeake Bay to the east.
Coordinates: 38°10′N 76°27′W / 38.167°N 76.450°W