Arnus Vallis
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| Arnus Vallis | |
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 Arnus Vallis Layers, as seen by HiRISE. Scale bar is 500 meters long. |
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| Coordinates | 14°06′N 289°30′W / 14.1°N 289.5°WCoordinates: 14°06′N 289°30′W / 14.1°N 289.5°W |
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]
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Arnus Vallis layers, as seen by HiRISE.
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