| Feature on | Mars | | Feature type | Albedo formation (volcanic plateau) | | Quadrangles | Primarily MC-09 Tharsis and MC-17 Phoenicis Lacus (with elements extending into MC-03 Arcadia, MC-10 Lunae Palus, MC-18 Coprates and MC-25 Thaumasia) | | Areographic coordinates | 55° N - 43° S, 215° - 300° E | | Dimensions | Diameter c. 5,000 km | | Notes | A vast volcanic plateau, primarily in the southern hemisphere of Mars, and extending for some five thousand kilometres from edge to edge. Its hightest peaks, including the volcanoes of the three Tharsis Montes, are in the northwestern parts of the region. The southwestern plains of the plateau, notably Solis Planum, are ringed by hills, and the uplands of the north and plains of the south meet in the fractured land of Noctis Labyrinthus. It is from this broken region in the central parts of Tharsis that the long, deep valley of Valles Marineris emerges to cut eastward far across the surface of Mars. |
An upland region, primarily in the southern hemisphere of Mars, but sufficiently extensive that its northern parts cross the Martian equator into the northern hemisphere. Its most prominent feature is a line of three gigantic volcanoes, collectively known as the Tharsis Montes. From west to east, these are Arsia Mons, Pavonis Mons and Ascraeus Mons.
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