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St. Marys River (Maryland) facts for kids

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St. Marys River
St. Mary's River (21006023454).jpg
A landscape image of the St. Marys River
Country United States
State Maryland
County St. Mary's County
Physical characteristics
River mouth Potomac River
0 feet (0 m)
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. 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.

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