The largest of these on Mars is Hellas Planitia, more than 1,3000 miles wide and 3.78 miles deep
These include impact craters that show exposed layered deposits (Milochau and
... [DOC] [TLE] Hellas Planitia | NASA [PAR] May 10, 2010 ... HiRISE will be used to investigate this in more detail when the basin is free from 
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