Mare Tyrrhenum (Mars)

Tyrrhenian Sea, between Italy and Sicily.

The Mare Tyrrhenum quadrangle is one of a series of 30 quadrangle maps of Mars used by the United States Geological Survey Astrogeology Research Program. The Mare Tyrrhenum quadrangle is also referred to as MC-22 The Mare Tyrrhenum quadrangle contains parts of the regions Tyrrhena Terra, Hesperia Planum, and Terra Cimmeria. The Mare Tyrrhenum quadrangle covers the area from 225° to 270° west longitude and 0° to 30° south latitude on Mars. (wikipedia entry)

A albedo feature is an area which shows a contrast in brightness or darkness (albedo) with adjacent areas. On Mars they are named after names from classical mythology assigned by Schiaparelli and Antoniadi.