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The Potomac River flows into the Chesapeake Bay, located along the mid-Atlantic coast of the United States. The river is approximately 405 miles long, with a drainage area of about 14,700 square miles. In terms of area, this makes the Potomac River the fourth largest river along the Atlantic coast of the United States and the 21st largest in the United States. Over 5 million people live within the Potomac watershed. (via Freebase)