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Summary

Groom Lake is a salt flat in Nevada used for runways of the Nellis Bombing Range Test Site airport (KXTA) on the north of the Area 51 USAF military installation. The lake at 4,409 ft (1,344 m) elevation is ~3.7 miles (6.0 km) from north to south and 3 miles (4.8 km) from east to west at its widest point. Located within the namesake Groom Lake Valley portion of the Tonopah Basin, the lake is northeast of Papoose Lake’s S-4 (Sector Four) location and ~25 mi (40 km) south of Rachel, Nevada.

Sources

http://en.wikipedia.org/wiki/Groom_Lake