This is half of a stereoscopic image of the surface of Mars. The other half is here, if you want to line them up, one in each eye, and see the Chasma in all its depth and glory. This is a Martian canyon named after the biblical land where Solomon sent a mission that returned with gold.
I found this via the USGS Astrogeology Planetary Photogrammetry Lab, although the LPL is a University of Arizona project.