Tibetan muleteers with a pack train approaching the village of Adong on the old tea-horse trail (the Cha Ma Gu Dao), from Deqin. Adong, a Tibetan village in a side valley off the upper Mekong (Lancang), is near the Tibetan border, north of Deqin, Yunnan, China. Adong is on the old tea-horse route, the Cha Ma Gu Dao.