The Khewra Salt Mine, also known as Mayo Salt Mine, is the world's second largest salt mine, located in Khewra, Punjab, Pakistan. The mine is in the Salt Range of the Potohar plateau, which rises from the Indus plain of the Punjab. 

The Salt Range is a mountain range in the north of Punjab province of Pakistan, deriving its name from its extensive deposits of rock salt. The range extends along the south of the Potohar Plateau and the north of the Jhelum River. The Salt Range contains the great mines of Khewra, Kalabagh and Warcha which yield vast supplies of salt. Coal of a medium quality is also found. The Salt Range starts from the Bakralla and Tilla Jogian ridges in the east and extends to the west of River Jhelum.