|St. Marys River|
|Location||St. Mary's County, Maryland, USA|
|Length||22.3 miles (35.9 km)|
|Mouth elevation||0 feet (0 m)|
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.
See also 
- "National Hydrography Dataset high-resolution flowline data". U.S. Geological Survey. Retrieved August 15, 2011.
- State of Maryland Geologic Survey: Rivers of Maryland
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