{{Short description|Vallis on Mars}} {{Infobox feature on celestial object |name = Arnus Vallis |image = [[File:Arnus Vallis Layers by Mars Reconnaissance Orbiter's HiRISE.JPG|200px]] |caption = Arnus Vallis Layers, as seen by [[HiRISE]]. Scale bar is 500 meters long. |coordinates = {{coord|14.1|N|289.5|W|globe:mars_type:landmark|display=inline,title}} }} '''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&nbsp;km long and was named after the classical and present day [[Arno River]] in [[Tuscany]], [[Italy]] (previously named Arena Rupes).<ref>{{cite web|url=http://planetarynames.wr.usgs.gov |title=Planetary Names: Welcome |publisher=Planetarynames.wr.usgs.gov |date= |accessdate=2022-03-20}}</ref>

<gallery class="center" widths="190px" heights="180px" > Image:Arnus Vallis layers.JPG|Arnus Vallis layers, as seen by [[HiRISE]]. </gallery>

== References == {{reflist}} {{Geography of Mars}} {{Portal bar|Solar System}}

[[Category:Valleys and canyons on Mars]] [[Category:Syrtis Major quadrangle]]

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