On Mars, the more than 4,000 km long, 200 km wide and up to 7 km deep, Valles Marineris rift system is the largest known canyon, surpassing all canyons on Earth more than 4,000 km long, 200 km wide and up to 7 km deep,[1][2] the Valles Marineris rift system is the largest known canyon, surpassing all land canyons on Earth (there is one larger under the Atlantic).
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