Carved out of Tuensang District, Longleng is a newly formed district of Nagaland. It is bordered by Mon District in the north, Mokokchung District in the west, Tuensang District in the south and Myanmar in the east. This is the tenth district of the state and is headquartered at Longleng, which is at an altitude of about 1,066 m above sea level.
Tamlu and Longleng are the major towns in the district. An Industrial Growth Center promoted by the state government functions in this district.