Topographical Mars . ... Credit Copyright: MOLA Team, MGS Project , NASA Explanation: Contrasting colors trace changing elevations in this new high-resolution topographic map of Mars . ... The martian topography is seen to range over 19 miles between the highest volcanic peaks (white) and the lowest regions (purple). ... Likely the result of an asteroid impact, Mars' deepest basin is about 1300 miles across making it one of the largest impact features in the Solar System. ...