OLYMPUS MONS

Is a very largeshield volcanoon the planetMars. The volcano has a height of nearly 22 km (13.6 mi or 72,000 ft) as measured by theMars Orbiter Laser Altimeter.Olympus Mons is about two and a half timesMount Everest's height above sea level. It is one of the largest volcanoes, the tallest planetary mountain, and the second tallest mountain currently discovered in theSolar System, comparable toRheasilviaonVesta. It is often cited as the largest volcano in the solar system. However, by some metrics, other volcanoes are considerably larger.Alba Mons, northeast of Olympus Mons, has roughly 19 times the surface area, but is only about one third the height.Pele, the largest known volcano on Io, is also much larger, at roughly 4 times the surface area, but is considerably flat. Additionally,Tharsis Rise, a large volcanic structure on Mars of which Olympus Mons is a part, has been interpreted as an enormous spreading volcano