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Arsia Mons 29er

Arsia Mons is the southernmost of the three great Tharsis Montes shield volcanoes on Mars, rising about 11.7 km above the datum and more than 9 km above the surrounding plains. It is enormous — roughly 435 km wide with a summit caldera over 100 km across — and is the second-largest volcano known by volume after Olympus Mons.
  Photos of Arsia Mons.

Viking imagery draped over MOLA topography of Arsia Mons (vertical exaggeration) (NASA/JPL/MOLA Science Team)
Arsia Mons
Quick facts
  • About 435 km across with a 110–138 km summit caldera
  • Roughly 30 times the volume of Hawaii's Mauna Loa
  • Second-largest known volcano by volume after Olympus Mons
  • Hosts a recurring orographic cloud each southern winter
  • Contains several possible cave-entrance pits