The Tharsis reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

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, Pavonis Mons, Arisa Mons and Ascraeus Mons. Tharsis is located on Mars' equator, at the western end of Valles Marineris.

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