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Yellowstone – Wyoming
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Surrounded by canyons, rivers, lakes, and mountain ranges, the Yellowstone Caldera is home to the largest super volcano on the continent. Grizzlies, free-ranging herds of bison, elk, and wolves are some of its many inhabitants. Possibly its most notable feature is Old Faithful, known as the most predictable geographical feature on Earth, as it erupts almost exactly every 91 minutes.