Orcus Patera

Orcus Patera is a region on the surface of the planet Mars first photographed by Mariner 4.

[2] It has experienced aeolian processes, and has some small craters and graben structures.

[2] A study in 2000 that incorporated new results from Mars Global Surveyor along with older Viking data, did not come out clearly in favor of either volcanic or cratering processes.

[3] Mars Express observed this region in 2005, yielding a digital terrain model and color pictures.

[2] It is about halfway between those two volcanoes, and east and north of Gale crater.