St. Marys River (Maryland)
| 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 Potomac River, near the Chesapeake Bay.
Coordinates: 38°10′N 76°27′W / 38.167°N 76.450°W
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