Arsia Mons | Article about Arsia Mons by The Free Dictionary
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Arsia Mons (ar -see-ă) A 14-km-high 400-km-wide volcano at the southern edge of the Tharsis Ridge of Mars. It is located just south of the Martian equator at the aerographic coordinates 8.4° S latitude, 121.1° longitude (see areography). It appears to be older than the other Tharsis volcanoes and has the largest summit caldera, 140 km across. See Mars, volcanoes.