Highs and lows

Highs and lows

. In these images, red denotes elevated regions of roughly 8 kilometers above the mean level, represented by green. Blue corresponds to 10 kilometers below the mean elevation. Flowing water would run downhill and collect in such low-lying regions. They include the Hellas basin (upper image), about 2.8 million meters across and the largest impact basin in the solar system, the Valles Marineris (lower image), shown as a horizontal gash beside the Tharsis volcanoes (pink), and the extensive lowland plains in the north (top of both images). These maps of the global topography of Mars were obtained with the laser altimeter on Mars Global Surveyor also see Fig. 2.39 of Section 2.4. (Courtesy of NASA, JPL and GSFC.)

Copyright 2010, Professor Kenneth R. Lang, Tufts University