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
Texas State Highway 51 SH 51 was designated on January 29, 1974; its routing has remained unchanged. Texas State Highway 51 Texas State Highway 51 (SH 51) is a short state highway located entirely in Hansford County, Texas, just south of Spearman. SH 51 begins at SH 207 southeast of Spearman and travels east through unincorporated Hansford County approximately . It is a two-lane route for its entire length, and has no intersections with other state-maintained routes until its terminus at FM 281, which continues to the east and south, and FM 760, which travels north to Spearman. The original SH 51 was designated