Roughly 35,000 years ago, the Potomac River began carving out the Great Falls of the Potomac. The waters of the river gather speed as they are forced through the narrow Mather Gorge and cascade over a series of several 20-foot (6-meter) falls. The water falls a total of 76 feet (23 meters) in elevation over a distance of less than 1 mile (1.6 km), making the Great Falls the steepest and most spectacular fall line rapids of any river in the eastern United States.
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