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The Potomac River is located in the east central part of the United States. The drainage area of the Potomac includes 14,670 square miles and stretches across parts of four states (Maryland, Pennsylvania, Virginia and West Virginia) as well as the District of Columbia.
How deep is the Potomac River? - Quora
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Potomac Basin Comprehensive Water Resources Plan
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Potomac Basin Facts - ICPRB
Interstate Commission on the Potomac River Basin, ICPRB