When you come to Great Falls Park, you are standing in two major watersheds. The Potomac River is the second largest source of freshwater for the Chesapeake Bay. This 384 mile long river's watershed covers over 15,000 square miles. Four states and Washington D.C. drain into the Potomac. Tributaries include the Anacostia, Shenandoah, Occoquan, and Monocacy Rivers.
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