At the Summit of Olympus Mons . ... The result was this stunningly detailed overhead view of the caldera or summit crater region of Olympus Mons . Fittingly named for the lofty abode of the gods of Greek mythology, Olympus Mons rises 21 kilometers above the surrounding plain or about 3 times the height of Mt. ... For comparison, hawaiian volcanic calderas range up to 18 kilometers in diameter. Outlined by steep cliffs , Olympus Mons itself is about 600 kilometers in diameter. ...