This images shows many channels from 1 to 10 meters (approximately 3 to 33 feet) wide on a scarp in Hellas impact basin. On Earth we would call these “gullies.”
Meanwhile, the much larger landforms that are typically called “gullies” on Mars would be called “ravines” on Earth.
Written by: Alfred McEwen (16 February 2011)
More info and image formats at http://hirise.lpl.arizona.edu/ESP_020940_1315
Image: NASA/JPL/University of Arizona