Licus Vallis [SEP] located on astronomical body
Licus Vallis
Licus Vallis is an ancient river valley in the Mare Tyrrhenum quadrangle of Mars, located at . It is long and was named after an ancient name for modern Lech River in Germany and Austria. 
See also.
- Geology of Mars
- HiRISE
- Vallis (planetary geology)
- Water on Mars
Herschel. Licus Vallis and the Ausonia Montes are other major features in the region. Some channels and dunes are visible in Tyrrhena Terra, as shown in the images below.
Dunes.
When there are perfect conditions for producing sand dunes, steady wind in one direction and just enough sand, a barchan sand dune forms. Barchans have a gentle slope on the wind side and a much steeper slope on the lee side where horns or a notch often forms. Some of the dunes in the pictures above are barchans.