Olympus Mons is the largest volcano on Mars and is also the solar system’s tallest mountain, at a height of 21.9km (two and a half times the height of Everest). Measuring 374 miles in diameter, it covers about the same amount of land as the state of Arizona. Olympus Mons is located near three other volcanoes known as the Tharsis Montes. The volcanoes in this area are all 10 to 100 times bigger than Earth’s largest volcanoes.
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