The Genesee River cascades over a drop in the eroded river bed in Letchworth State Park, New York. The area was once submerged under an inland sea, which left deposits that formed sandstone and shale. The Genesee River eroded the river bed, forming small drops like this, as well as the Letchworth Gorge, which is 22 miles (35 km) long and as much as 550 feet (168 meters) deep.
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