| Arnus Vallis | |
|---|---|
Arnus Vallis Layers, as seen by HiRISE. Scale bar is 500 meters long. |
|
Arnus Vallis is an ancient river valley in the Syrtis Major quadrangle of Mars, located at 14.1° north latitude and 289.5° west longitude. It is 280 km long and was named after the classical and present day Arno River in Tuscany, Italy (previously named Arena Rupes).[1]