Potomac River

The Potomac River is located on the east coast of the United States, and runs through Maryland, Virginia, West Virginia, and Washington, D.C. before it empties into the Chesapeake Bay. It is over 380 miles long and wider than 11 miles at its widest point.[1]

References

  1. http://www.potomacriver.org/about_potomac/about_the_potomac.htm