Khewra Salt Mines

Entering the Khewra mines by rail — a narrow-gauge electric train carries visitors into the mountain — the temperature drops sharply from the Punjabi summer heat, and the walls of the tunnel begin to show pink and off-white strata of crystallised salt that make it immediately clear that this is not a typical mine, and the changing colours of the salt bands as the train progresses give a geological education in the space of a few minutes.

The main chamber is named after a British geologist who surveyed the deposit, and its ceiling arches overhead in a vaulted space carved by hand over centuries of patient extraction, the walls banded in rose pink, cream and grey salt that catches the electric light and glows in a way that seems artificial but is entirely natural, and the scale of the chamber is genuinely surprising after the intimacy of the tunnel approach.

The salt formations grow in clusters of crystals on the walls and ceiling, some transparent, some clouded white, some with a faint blush of pink from iron oxide impurities in the rock, and touching them reveals the crystalline structure under your fingertips in a way that photographs cannot capture, with the salt flaking slightly under pressure and leaving a sharp mineral taste on your skin.

A brine pool in one of the chambers — a pool of saturated salt water that has accumulated from underground springs — reflects the rock walls perfectly and is used by visitors for therapeutic bathing, a practice with a long history at this site, and the mineral content of the water is reported to be beneficial for skin conditions and respiratory ailments, giving the mine a medical function alongside its commercial and tourist roles.

The mining galleries extend for kilometres into the mountain and some of the older chambers have been abandoned for decades, their original timber supports still intact and creating an atmosphere that is part industrial archaeology and part natural wonder, with the timber darkened by salt crystallisation over the decades into a material that looks almost like coral.

Pakistan's pharmaceutical and food industries depend on Khewra for a significant proportion of their salt supply, and the mine produces rock salt, refined salt and salt for industrial use alongside the tourist operations, making it a living mine rather than a heritage site, and the coexistence of working mining equipment alongside Victorian-era tunnels creates a layered historical landscape that is unique.

The landscape above the mine — the Salt Range plateau — is a semi-arid terrain of sculpted rock formations and dramatic cliffs that is rarely visited by tourists but offers an austere beauty that complements the underground experience, and the plateau is also geologically significant as one of the few exposed sections of the Salt Range formation that underlies much of the Potohar Plateau.

Khewra is among the largest and oldest salt mines in the world, with documented extraction dating to the 4th century BCE, and its combination of geological spectacle and living mining operations makes it unique among industrial heritage sites.

The pink and off-white salt formations inside the mine are visually remarkable and provide a concrete demonstration of geological processes that created one of the world's great mineral deposits.

The therapeutic use of the brine pool connects the site to a centuries-long tradition of medicinal salt use that is part of the region's cultural heritage.