Medusae Fossae (Mars)

This feature is named after an earlier feature.

The Medusae Fossae Formation is a large geological unit of uncertain origin on the planet Mars. It is named for the Medusa of Greek mythology. "Fossae" is Latin for "trenches". Located roughly at 5°S 213°E, it straddles the highland - lowland boundary near the Tharsis and Elysium volcanic areas. (wikipedia entry)

A fossa is a long, narrow, shallow depression. On Mars they are named after the nearest named albedo feature on the Schiaparelli or Antoniadi maps.