St. Marys River | |
Mouth Location: | Potomac River |
Subdivision Type1: | Country |
Subdivision Name1: | United States |
Subdivision Type2: | State |
Subdivision Name2: | Maryland |
Subdivision Type3: | County |
Subdivision Name3: | St. Mary's County |
Length: | 22.3miles |
Mouth Elevation: | 0feet |
The St. Marys River (sometimes spelled St. Mary's River) is a 22.3adj=midNaNadj=mid[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 2miles wide at its mouth on the north bank of the Potomac River, near the Chesapeake Bay to the east.