ON THE EDGE of Terra Sirenum, lava flows and rugged terrain intermingle, as volcanic eruptions from Arsia Mons in Tharsis reach southwest to the cratered highlands. This view looks north over an impact crater 43 km (27 mi) wide, and has no vertical exaggeration. (A 440 kB version of the image is available.) Credit: NASA/JPL/Arizona State University, R. Luk.
To explore this area further, check out the THEMIS feature article.