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Orcus Patera is an enigmatic elliptical depression located between the volcanoes of Elysium Mons and Olympus Mons. This well-defined depression extends approximately 380 by 140 kilometres in a north-northeast to south-southwest direction. It has a rim that rises up to 1800 metres above the surrounding plains, while the floor of the depression lies 400 to 600 metres below the surroundings. The straight graben that cut across the rim are clearly visible in this image.
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