Portion of the global topography of Mars from the Mars Global Surveyor (MOLA) and Mars Express (HRSC) spacecraft (source: https://astrogeology.usgs.gov/search/map/Mars/Topography/HRSC_MOLA_Blend/Mars_HRSC_MOLA_BlendDEM_Global_200mp)
Overlay is a 5-color density slice from the topography; this also indicates elevation: blue for the lowest elevations, greens for higher, with tan for even higher elevations, and pink and silver for the highest elevations.
This section is the northern hemisphere (0° - 88° N) from longitude 180°E to 270°E, 10x vertical exaggeration.
The huge volcano just south of the model center is Olympus Mons, one of the large shield volcanos in the Tharsis province.