{{Short description|Mars geographical feature}} {{Infobox feature on celestial object |name = Mad Vallis |image = Mad Vallis.JPG |caption = Mad Vallis, as seen by [[HiRISE]]. Picture on right is an enlargement of part of the other picture. |coordinates = {{coord|56.5|S|283.9|W|globe:mars_type:landmark|display=inline,title}} }} '''Mad Vallis''' is a [[vallis (planetary geology)|vallis]] (valley) in the [[Hellas quadrangle]] of Mars, with its location centered at 56.5° S and 283.9° W. It is 524&nbsp;km long and was named after the [[Mad River (Vermont)|Mad River]] in [[Vermont]], USA.<ref>{{gpn|3561}}</ref>

== References == {{reflist}}

{{Geography of Mars}} {{Portal bar|Solar System}}

[[Category:Valleys and canyons on Mars]] [[Category:Hellas quadrangle]]

{{Mars-stub}}