Area 51 the base extends further east. After leaving the restricted area, Groom Lake Road descends eastward to the floor of the Tikaboo Valley, passing the dirt-road entrances to several small ranches, before converging with State Route 375, the "Extraterrestrial Highway", south of Rachel. Area 51 shares a border with the Yucca Flat region of the Nevada Test Site, the location of 739 of the 928 nuclear tests conducted by the United States Department of Energy at NTS. The Yucca Mountain nuclear waste repository is southwest of Groom Lake. Groom Lake is a salt flat in Nevada used for runways of the
Florida State Road 51 Mill. After crossing a narrow bridge over the Little Alapaha River it intersects a dirt road named Northwest 13th Street which leads to US 129 near Avoca. The rest of the journey of CR 51 is surrounded by scrub forest. County Road 51 runs north to the Georgia border at a T intersection with two dirt roads named Flaline Break Road and Barnes Road, the latter of which is entirely dirt as far north as its terminus with State Route 94 at Tarver, Georgia. Florida State Road 51 State Road 51 (SR 51) is a north–south state highway in north