Gullies in Hellas Planitia (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit)

Images like this from the High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter show portions of the Martian surface in unprecedented detail. This one shows many channels from 1 meter to 10 meters (approximately 3 feet to 33 feet) wide on a scarp in the Hellas impact basin. On Earth we would call these Gullies. Some larger channels on Mars that are sometimes called Gullies are big enough to be called ravines on Earth.

This view is an excerpt from a HiRISE observation taken on Jan. 14, 2011, nearly five years after the March 10, 2006, arrival of the Mars Reconnaissance Orbiter at Mars. North is up. The image was taken at 15:44 Local Mars Time. The observation is centered at 48,4° South Latitude, 73,5° East Longitude.