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The Mariner’s Valley is the largest feature of its kind discovered anywhere in the solar system to date. It is shown here to scale with the continental United States. This vast surface feature - 10 times the length of our own Grand Canyon, and 3 to 4 times its depth - overlaps both the east and the west coasts. Ares Vallis, landing site of the Pathfinder spacecraft and rover, is located northeast of the Mariner’s Valley, and would be to the right of the upper right hand corner of this photograph.
Slide 12 of 22