Arnus Vallis

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Arnus Vallis
Arnus Vallis Layers by Mars Reconnaissance Orbiter's HiRISE.JPG
Arnus Vallis Layers, as seen by HiRISE. Scale bar is 500 meters long.
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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]