Pitted Plain

This MOC image shows a chain of collapse pits on a dust-mantled, lava-covered plain northeast of Ascraeus Mons -- one of the giant volcanoes located in the Tharsis region of Mars

This MOC image shows a chain of collapse pits on a dust-mantled, lava-covered plain northeast of Ascraeus Mons -- one of the giant volcanoes located in the Tharsis region of Mars

MarsMars Global Surveyor MGS