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Wide view of the Olympus Mons aureole, escarpment and caldera

Olympus Mons is the highest known volcano and mountain in the Solar System. It is located on the planet Mars at approximately 18°N 133°W. Since the late 19th century—well before space probes confirmed its identity as a mountain—Olympus Mons was known to astronomers as the albedo feature, Nix Olympica ("Snows of Olympus"), although its mountainous nature was suspected.