Yellowstone National Park's nearly 3,500 square miles seep slightly across state borders into Montana and Idaho ... Canyon of the Yellowstone and Hayden Valley. The Grand Canyon of the Yellowstone ...
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If Yellowstone erupted, ash could reach the Central ValleyThe states closest to Yellowstone, like Montana, Idaho and Wyoming ... You can see those ash beds outlined in the map below. The most recent eruption, which happened roughly 640,000 years ago ...
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