Area 51 Nellis Bombing Range Test Site airport (KXTA) on the north of the Area 51 USAF military installation. The lake at elevation is approximately from north to south and from east to west at its widest point. Located within the namesake Groom Lake Valley portion of the Tonopah Basin, the lake is south of Rachel, Nevada. The origin of the Area 51 name is unclear. The most accepted comes from a grid numbering system of the area by the Atomic Energy Commission (AEC); while Area 51 is not part of this system, it is adjacent to Area 15. Another explanation is
Ohio State Route 51 Toledo and Sylvania across the Maumee River and on Monroe Street. U.S. Route 223 now officially ends at U.S. Route 23's interchange with State Routes 51 and 184 in Sylvania. State Route 51's interchange with the Ohio Turnpike was opened in 1997. Ohio State Route 51 State Route 51 (SR 51) is a northwest-southeast highway (signed north-south) in northwest Ohio. Its southern terminus is at U.S. Route 20 just south of Elmore, Ohio, and its northern terminus is at its interchange, along with State Route 184, at U.S. Route 23 in Sylvania, Ohio. Before an ODOT signage project in 2010,