Padus Vallis, as seen by THEMIS.
Padus Vallis is a valley in the Memnonia quadrangle on Mars that empties into the Medusa Fossae Formation. It is located at 4.6° S and 150.1° W. It is 46.0 km long and was named for the classical name for modern Po Valley in Italy. Padus Vallis is one of many valleys that empty into the Medusae Fossae Formation.
Original source: https://en.wikipedia.org/wiki/Padus Vallis. Read more