Yellowstone Caldera
The Yellowstone Caldera is a volcanic caldera and supervolcano in Yellowstone National Park in the Western United States. It is sometimes referred to as the Yellowstone Supervolcano. The caldera and most of the park are in the northwest corner of Wyoming. The caldera is about 55 by 72 km. It was formed during the last of the three supereruptions that occurred over the last 2.1 million years.