The Khewra Salt Mine, also known as the Mayo Salt Mine, is the second largest salt mine globally and is situated in Khewra, Punjab, Pakistan. Located within the Salt Range of the Potohar plateau, it rises from the Indus plain in Punjab. Renowned for its production of pink Khewra salt—often marketed as Himalayan salt—the mine is a significant tourist destination, attracting up to 250,000 visitors annually. Its origins trace back to its discovery by Alexander the Great’s troops in 326 BC, though it began trading during the Mughal era. The main tunnel at ground level was developed by mining engineer H. Warth in 1872 during British rule. After Pakistan’s independence, the mine was managed by the BMR until 1956, then by the PIDC until 1965. Following the 1965 India-Pakistan war, the WPIDC took over its administration. In 1974, control was transferred to the Pakistan Mineral Development Corporation, which continues to oversee it. The mine remains the largest salt source in Pakistan, producing over 350,000 tons of nearly pure halite annually. Estimates of the salt reserves vary widely, ranging from 82 million tons to 600 million tons.