Tank is a southern district in the Khyber Pakhtunkhwa province of Pakistan. The city of Tank is the capital of the district, which consists of Union Council City I and Union Council City II. It is located at 32º13′ N. and 70º32′ E and is situated to the north-west of the Indus River and close to the Takht-i-Sulaiman Range. There are totally sixteen Union councils of district Tank. Tank was formerly part (Tahsil) of district Dera Ismail Khan District. Tank is bounded by the districts of Lakki Marwat to the northeast, Dera Ismail Khan to the east and southeast, and South Waziristan to the southwest, west, and northwest. The climate in Tank reaches 110-120 °F. However in the cold, harsh winters in the mountains to the west, people come to Tank to enjoy a pleasant stay and then resort back during the summer.
The city was previously situated inside a fort. Here Sir Henry Durand, lieutenant-governor of the Punjab, was killed in 1870 when passing on an elephant under a gateway.
Tank was the terminus railway station of Tank-Mari Indus Narrow gauge (762 mm or 2 ft 6 in) railway line. This railway line was closed in 1991.
Pashto is the main language spoken in Tank. There are also many people speaking Saraiki. The vast majority of people are conversant in Urdu. English is understood by the educated.
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