This image shows gullies that are large even by Mars standards, and much larger than the terrestrial landforms we call gullies. The length of some of these is over 6 kilometers (3.6 miles).
They are located on large mountains north of the Argyre impact basin. An enhanced color view (reduced scale) shows only subtle color differences.
Written by: Alfred McEwen (22 January 2014)
More info and image formats at http://hirise.lpl.arizona.edu/ESP_034829_1325
Image: NASA/JPL/University of Arizona