Vallis (planetary geology)
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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.
Valley
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A valley is an elongated low area often running between hills or mountains, which typically contains a river or stream running from one end to the other. Most valleys are formed by erosion of the land surface by rivers or streams over a very long period. Some valleys are formed through erosion by glacial ice. These glaciers may remain present in valleys in high mountains or polar areas.
Calchaquí Valley in Argentina
U-shaped valley in Glacier National Park, Montana, United States
Romsdalen in Western Norway has almost vertical walls.
Fljótsdalur in East Iceland, a rather flat valley