Arnus Vallis

Arnus Vallis Layers, as seen byHiRISE. Scale bar is 500 meters long.
Coordinates	14°06′N289°30′W / 14.1°N 289.5°W /14.1; -289.5

Arnus Vallis is an ancient river valley in theSyrtis 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 dayArno River inTuscany,Italy (previously named Arena Rupes).^[1]

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  Arnus Vallis layers, as seen byHiRISE.

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