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Yellowstone has a complex geologic history. Grand Canyon of Yellowstone is the first large canyon on the Yellowstone River downstream...
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Grand Canyon of Yellowsone

Yellowstone National Park

Yellowstone has a complex geologic history. Grand Canyon of Yellowstone is the first large canyon on the Yellowstone River downstream from Yellowstone Falls in Yellowstone National Park in Wyoming. The canyon is about 20 miles long, 4,000 feet wide and 1,200 feet deep in places. Photo © copyright by Debbie McCulliss.