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Mars has the second highest known mountain within the Solar System (the tallest on a planet) - the mighty Olympus Mons. Olympus Mons is the youngest of the large volcanoes on Mars, having formed during Mars’s Amazonian Period. It has a height of nearly 22 km (14 mi) by one measure and stands almost three times as tall as Mount Everest’s height above sea level.
Mars is the site of Valles Marineris, the greatest gorge on any planet in the Solar System.