ABQCOWBOY
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The largest Volcano in the world is actually the Yellowstone Caldera or Super Volcano and it's not just one Volcano, it's actually three separate Calderas. Henry's Fork in Idaho (18 Miles long and 23 miles wide), the Island Park Caldera located in Idaho and Wyoming (40 Miles by 49 miles) and the Yellowstone Caldera located in Wyoming (35 by 45 Miles). The magma chamber, or the actual Super Volcano, that feeds all of these Calderas is estimated to be 55 Miles by 22 Miles measures 6 Miles deep.