Tharsis Montes
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The Tharsis Montes are three large shield volcanoes in the Tharsis region of the planet Mars. From north to south, the volcanoes are Ascraeus Mons, Pavonis Mons and Arsia Mons. Mons is the Latin word for mountain; it is a descriptor term used in astrogeology for mountainous features in the Solar System.
Arsia Mons, southernmost peak of Tharsis Montes.
Pavonis Mons, the central peak of Tharsis Montes.
The caldera of Ascraeus Mons, northernmost peak of Tharsis Montes.
Tharsis
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Tharsis is a vast volcanic plateau centered near the equator in the western hemisphere of Mars. The region is home to the largest volcanoes in the Solar System, including the three enormous shield volcanoes Arsia Mons, Pavonis Mons, and Ascraeus Mons, which are collectively known as the Tharsis Montes. The tallest volcano on the planet, Olympus Mons, is often associated with the Tharsis region but is actually located off the western edge of the plateau. The name Tharsis is the Greco-Latin transliteration of the biblical Tarshish, the land at the western extremity of the known world.
MOLA topography of the Thaumasia Plateau (Syria-Thaumasia block) and southern Tharsis. The volcano shown at the left is Arsia Mons. Valles Marineris extends across the northern edge. The areas in brown have the highest elevations on the Tharsis Plateau and may be considered the "summit region" of the Tharsis bulge.
Orographic water ice clouds hover over the volcanic peaks of the central Tharsis region in this color image mosaic from Mars Global Surveyor. Olympus Mons dominates at upper left. At center are the three Tharsis Montes: Arsia Mons at bottom, Pavonis Mons at center, and Ascraeus Mons at top.
Images of ice water clouds over Tharsis taken by the ExoMars Trace Gas Orbiter, 2016