Located at an altitude of 14,140 feet and 56kms from Gangtok, Nathula Pass was the place through which the famous Silk Route used to operate until 1962. This used to be the silk trade route between India and Tibet. Lines of mules used to carry silk, gold and many other items from Tibet to India and take daily essentials back to Tibet.The route in Tibet goes down the Chumbi Valley to Yathung, a place about 30kms away which once used to be a major trading township (no longer so). In fact on a clear day you can see this route winding down the valley. If you look at the eastern horizon, you can see the magnificent peak of Chomolhari of Bhutan.