The St. Marys River (sometimes spelled St. Mary's River) is a 22.3-mile-long (35.9 km)[1] 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. Mary's 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.

St. Marys River
A landscape image of the St. Marys River
Location
Country	United States
State	Maryland
County	St. Mary's County
Physical characteristics
Mouth
• location	Potomac River
• elevation	0 feet (0 m)
Length	22.3 miles (35.9 km)

See also

• List of Maryland rivers

References