The city of Leh, a little way from the Indus River along the Khardung La valley, is a historic trading town with trade routes to Yarkand and Tibet on the one hand, and Srinagar and rest of the Indian subcontinent on the other. The summer route from Leh to Yarkand passed through Khardung La to pass into the Nubra valley and thence to Yarkand via the Karakoram Pass and Suget Pass (in the Trans-Karakoram Tract). The winter route passed through Digar La to reach the Shyok river valley and, again, reach the Karakoram Pass. The trade route to Tibet went via Gartok in the Indus river valley at the foot of the Kailash Range. By the Treaty of Tingmosgang signed in 1684, Ladakh had the exclusive right to trade in the pashmina wool from Tibet, which led to its prosperity.