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)
This section is the southern hemisphere (0° - 88° S) from longitude 0°E to 90°E, 10x vertical exaggeration.
The large impact on the right side of the model is the Hellas Basin.