The channels of the Hephaestus Fossae region of Mars likely formed when impacts released subsurface water in massive floods. Data from the Mars Express orbiter provides the basis for this elevation map. Cool colors represent depressions; warmer colors are higher areas. Purple indicates places about 4200 meters deep. The scale is 75m/pixel. Image assembled from data available at http://hrscview.fu-berlin.de.

ESA/DLR/FU Berlin (G. Neukum)