This Magellan SAR image is of Sapas Mons, one of the larger venusian volcanos, shown at the same scale as a Viking photographic image mosaic of Olympus Mons, the largest volcano on Mars. The two volcanos are comparable in diameter, but Sapas Mons rises only 4 kilometers above the surrounding plains while Olympus Mons is more than 20 kilometers high. Olympus Mons image obtained from the Mars Multi-Scale Map, Calvin Hamilton (Los Alamos National Laboratory). Click here to view a high-resolution version of the image (1.04 MB)
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