Tharsis
The Tharsis region on Mars is an enormous volcanic upland. It contains the Tharsis Bulge, on which some of the solar system's largest volcanos are located. Olympus Mons is at top left. At center, diagonally from top to bottom are Ascraeus Mons, Pavonis Mons and Arsia Mons (collectively known as Tharsis Montes).Tharsis is located on Mars' equator, at the western end of Valles Marineris.
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Courtesy NASA/JPL-Caltech