This image shows portions of what could be called “giant gullies.”
Actually, most of the Martian features called “gullies” would be called “ravines” on Earth, given their size. The depositional fans have been covered or heavily modified by glacial flows. (See PSP_006672_1420 for an adjacent image showing more of this dramatic landscape.)
For a wider-scale overview of this region, see the MRO CTX image .
Written by: Alfred McEwen (26 January 2011)
This is a stereo pair with ESP_020860_1420 .
More info and image formats at http://hirise.lpl.arizona.edu/ESP_020794_1420
Image: NASA/JPL/University of Arizona