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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 / 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.