This image from NASA Mars Odyssey shows part of the summit caldera of Pavonis Mons, the middle of three Tharsis volcanos that form a line southeast of Olympus Mons and northwest of Vallis Marineris.
This image from NASA Mars Odyssey shows part of the summit caldera of Pavonis Mons, the middle of three Tharsis volcanos that form a line southeast of Olympus Mons and northwest of Vallis Marineris.