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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 by 600 metres below the surroundings. ESA's Mars Express obtained image data of this region on 5 and 11 October 2005 using the High-Resolution Stereo Camera (HRSC). The data were acquired during orbits 2216 and 2238 and with a ground resolution of approximately 30 metres per pixel. Combining data from the nadir channel and one stereo channel of HRSC produced this 3D image. Stereoscopic glasses are required to see the 3D effect.
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