Terraces on Upper Slopes of Olympus Mons. The origin of the lava terraces is not known. In some respects, they are analogous to terraced features seen on pahoehoe flows on Mount Etna, Sicily, where they are formed as a result of embankments developing at the fronts of lava flows and the accumulation of lava lakes behind the embankments. Some of the craters appear to be rimless volcanic pits. The image is about 95 km across.
North is to the top of the image.