The Tharsis region on Mars is an enormous volcanic upland located on Mars' equator, at the western end of Valles Marineris. It contains the Tharsis Bulge, on which some of the solar system's largest volcanos are located.

The vast size of the Tharsis Bulge had a great impact on the geology of Mars. Tharsis is surrounded by a ring-shaped topographical depression called the Tharsis trough, and on the opposite side of the planet is a smaller bulge called Arabia Terra which may have formed as a result of the weight of Tharsis. These features were a major influence on the formation of Mars' drainage valleys, most of which formed in the late Noachian epoch. The large quantities of carbon dioxide and water vapor that could have been outgassed by Tharsis magma may have also played a significant role in Mars' wet period; Roger J. Phillips calculated in 2001 that it could have formed a 1.5-bar carbon dioxide atmosphere and a global layer of water that averaged 120 meters thick.

The name Tharsis comes from the bible, where it was the name for the land at western extremity of the known world.

Tharsis viewed on Google Mars

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