The 621-mile by 1,240-mile (1,000 by 2,000-kilometer) region of Tyrrhena Terra (outlined by the white box in the inset) sits between two regions of low altitude in Mars' southern hemisphere, as shown ... more 
The 621-mile by 1,240-mile (1,000 by 2,000-kilometer) region of Tyrrhena Terra (outlined by the white box in the inset) sits between two regions of low altitude in Mars' southern hemisphere, as shown in this global topography map. Hydrated mine less 
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SPACE.com | Photo By NASA/MOLA Science Team /D. Loizeau et al.
Mon, Jul 2, 2012 1:01 PM EDT