Tyrrhena Terra (Mars)

This feature is named after an earlier feature.

Tyrrhena Terra is a large area on Mars, centered south of the Martian equator and immediately northeast of the Hellas basin. Tyrrhena Terra is typical of the southern Martian terrae, with heavily cratered highlands and other rugged terrain. It contains the large volcano Tyrrhena Patera, one of the oldest volcanoes on Mars. (wikipedia entry)

A terra is an extensive land mass. On Mars they are named after the nearest named albedo feature on the Schiaparelli or Antoniadi maps.