This shows the largest of the newly detected graben found in highlands of the lunar farside. The broadest graben is about 1,640 feet (500 meters) wide and topography derived from Lunar Reconnaissance Orbiter Camera (LROC) Narrow Angle Camera (NAC) stereo images indicates they are almost 66 feet (20 meters) deep. Credit: NASA/Goddard/Arizona State Univ./Smithsonian Institution