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. Marys City, approximately 2 miles (3 km) wide at its mouth on the Potomac River, near the Chesapeake Bay.
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Waters of Maryland
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Coordinates: 38°10′N 76°27′W / 38.167°N 76.450°W / 38.167; -76.450
