Hadriacus Mons (Mars)

This feature is named after an earlier feature.

Hadriacus Mons is an ancient, low-relief volcanic mountain on the planet Mars, located in the southern hemisphere just northeast of the impact basin Hellas and southwest of the similar volcano Tyrrhenus Mons. It has a diameter of 450 kilometres The name was approved in 2007. The flanks have been eroded into gullies; its southern slopes are incised by the outflow channel Dao Vallis. (wikipedia entry)

A mons is a mountain. On Mars they are named after the nearest named albedo feature on the Schiaparelli or Antoniadi maps.