Orcus Patera (Mars)

This feature is named after an earlier feature.

Orcus Patera is a region on the surface of the planet Mars first imaged by Mariner 4. It is a depression about 380 km long, 140 km wide, and about 0.5 km deep but with a smooth floor. It has a rim up to 1.8 km high. Orcus Patera is west of Mons Olympus and east of Elysium Mons. (wikipedia entry)

A patera is an irregular crater, or a complex one with scalloped edges. Usually the dish-shaped depression atop a volcano. On Mars they are named after the nearest named albedo feature on the Schiaparelli or Antoniadi maps.