This is the location with the most impressive known gully activity in the Northern hemisphere. Gullies are active in the winter due to carbon dioxide frost, but northern winters are shorter and warmer than southern winters, so there is less frost and less gully activity.

An enhanced-color image cutout shows recent gullies with bright colors .

Written by: Alfred McEwen (audio: Tre Gibbs)  (18 April 2017)

More info and image formats at http://hirise.lpl.arizona.edu/ESP_049083_2320

Image: NASA/JPL/University of Arizona