The elongated hills in this VIS image are a feature termed yardangs. Yardangs are formed by wind activity in regions where the surface material is not well cemented. The elongation indicates the direction of the wind. Orbit Number: 65299 Latitude: -10.1078 Longitude: 183.91 Instrument: VIS Captured: 2016-09-02 13:39 http://photojournal.jpl.nasa.gov/catalog/PIA21019