<Tr> <Th_colspan="2"> Climbing </Th> </Tr> <Tr> <Th> Easiest route </Th> <Td> Hike / auto / bus </Td> </Tr> <P> The Yellowstone Caldera is a volcanic caldera and supervolcano in Yellowstone National Park in the Western United States, sometimes referred to as the Yellowstone Supervolcano . The caldera and most of the park are located in the northwest corner of Wyoming . The major features of the caldera measure about 34 by 45 miles (55 by 72 km). </P> <P> The caldera formed during the last of three supereruptions over the past 2.1 million years: the Huckleberry Ridge eruption 2.1 million years ago (which created the Island Park Caldera and the Huckleberry Ridge Tuff); the Mesa Falls eruption 1.3 million years ago (which created the Henry's Fork Caldera and the Mesa Falls Tuff); and the Lava Creek eruption approximately 630,000 years ago (which created the Yellowstone Caldera and the Lava Creek Tuff). </P>

Is there a supervolcano in yellowstone national park