Cerberus Fossae is an extensive fracture system in the southern part of Elysium Planitia.
These fractures have acted as a conduit for the release of water and lava onto the surface relatively recently in Martian geologic history. Dark sediment from the trough walls are visible, as well as some subsurface layers.
This is a stereo pair with PSP_004006_1900.
Photo credit: NASA/JPL/University of Arizona