Mad Vallis
Encyclopedia
Mad Vallis is a valley in the Hellas quadrangle
Hellas quadrangle
The Hellas quadrangle is one of a series of 30 quadrangle maps of Mars used by the United States Geological Survey Astrogeology Research Program. The Hellas quadrangle is also referred to as MC-28 ....

 of Mars, with its location centered at 56.5° S and 283.9° W. It is 524 km long and was named after the Mad River
Mad River (Vermont)
The Mad River is a tributary to the Winooski River in Vermont. It has its headwaters in Granville Gulf, then flows north through the towns of Warren, Waitsfield, and Moretown before entering the Winooski River just downstream from Middlesex. Other towns within the Mad River watershed are the...

 in Vermont
Vermont
Vermont is a state in the New England region of the northeastern United States of America. The state ranks 43rd in land area, , and 45th in total area. Its population according to the 2010 census, 630,337, is the second smallest in the country, larger only than Wyoming. It is the only New England...

, USA.
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