Canyon Details -- Earth and Mars

Earth’s closest analogue to Valles Marineris is the Grand Canyon. Even though Mars is about half the size of Earth, Valles Marineris is about 4 times deeper, 20 times wider, and 10 times longer than the Grand Canyon. At 4,000 km long, Valles Marineris would almost span the distance from the west coast to the east coast of the United States. The image on the right is 60 km across.

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