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Vallis on Mars From Wikipedia, the free encyclopedia
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]
 Arnus Vallis Layers, as seen by HiRISE. Scale bar is 500 meters long. | |
| Coordinates | 14.1°N 289.5°W |
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