Semipalatinsk Test Site
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The Semipalatinsk Test Site, also known as "The Polygon", was the primary testing venue for the Soviet Union's nuclear weapons. It is located in Zhanasemey District, Abai Region, Kazakhstan, south of the valley of the Irtysh River. The test site... Wikipedia
Area: 18,000 km2 (6,950 sq mi)
Coordinates: 50°07′N 78°43′E / 50.117°N 78.717°E
In use: 1949 – 1991
Nuclear tests: 456 (340 underground and 116 aboveground)
Status: Inactive
Subcritical tests: not known