Khewra Salt Mines is a salt mine located in Khewra, Jhelum District, Punjab in Pakistan, about 160 kilometres from Islamabad and 260 kilometres from Lahore. It attracts up to 40,000 visitors per year and is the second largest salt mine in the world. Situated in the foothills of the Salt Range, the Khewra Salt Mines are the oldest in the sub-continent.Salt has been mined at Khewra since 320 BC, in an underground area of about 110 sq. km. Khewra salt mine has estimated total of 220 million tones of rock salt deposits. The current production from the mine is 325,000 tons salt per annum.
Geologists put the age of rock-salt found in Khewra at about 600 million years. In geological timescale this time period is called precambrian Roof of Salt Mine, Khewra, Pakistan