CHAGHI/Chagai is the largest district of Pakistan and is located on the north west corner of Balochistan, Pakistan. It forms a triangular border with Afghanistan and Iran. Pakistan conducted a nuclear weapons test in 1998 at Ras Koh Hills Chagai District.Chaghi/Chagai District was created in 1896. Nushki was the only sub division of the district with two tehsils, Nushki and Dalbandin. Naukundi sub tehsil was upgraded to tehsil in 1950. Chagai district was attached to Kalat District in 1957 but was detached after two years. The Police Department is still under the Superintendent of Police, Kalat. Dalbandin Tehsil was upgraded to Sub-Division on 1 February, 1978. Taftan was created as sub tehsil in 1981. Chagai sub-tehsil was created with effect from 1 October, 1985. The Assistant Political Agent Nushki remained sub-Divisional Magistrate of Nushki Sub Division till September 1989 when an independent post of Additional Political Agent was created for the district. Very little is known about the ancient history of Chagai 1998 Pakistan conducted their first ever nuclear weapons test at Ras Koh Hills Chagai District.