NASA's Mars Global Surveyor shows a regional topographic model of the Hellas basin on Mars.

Regional topographic model of the Hellas basin. (Top) Azimuthally-averaged radial topography used in the calculation of infilling the basin with surrounding material postulated to have been excavated from it. (Bottom) Color-coded topography plotted in an equal-area projection. The black lines correspond to zero-elevation contours.

View all Images