Vallis or valles is the Latin word for valley. It is used in planetary geology to name landform features on other planets.
Nirgal Vallis that runs in two quadrangles has features looking like those caused by sapping. Picture taken with THEMIS.
Nirgal Vallis Close-up, as seen by THEMIS.
Kasei Valles, as seen by THEMIS.
Hypanis Vallis in the Lunae Palus quadrangle of Mars, as seen by HiRISE. Scale bar is 500 meters long.
The Vedra Valles are a set of channels in an ancient river valley in the Lunae Palus quadrangle of Mars, located at 19.4° N and 55.6° W. They are 115 km long and were named after an ancient river in G
Waters from the Vedra Valles, Maumee Valles, and Maja Valles flowed from Lunae Planum on the left, to Chryse Planitia on the right. Image is located in Lunae Palus quadrangle and was taken by Viking Orbiter.