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Ascraeus Mons 29er

Ascraeus Mons is a giant shield volcano in the Tharsis region of Mars and the northernmost of the three Tharsis Montes. It rises about 14.9 km from base to peak (roughly 18 km above the Martian datum) and stretches some 480 km across, making it the second-tallest volcano on Mars after Olympus Mons.
  Photos of Ascraeus Mons.

THEMIS daytime infrared mosaic of Ascraeus Mons (NASA/JPL/ASU (Mars Odyssey THEMIS))
Ascraeus Mons
Quick facts
  • Northernmost and tallest of the Tharsis Montes chain
  • Shield volcano ~480 km across with gentle ~7° slopes
  • Summit caldera central pit ~24 km wide, ~3.4 km deep
  • Originally cataloged as “North Spot” by Mariner 9
  • Shows fan-shaped glacial deposits on its western flank