The car crossed the bridge into Wuyuan County, and it passed through a canyon that stretched 55 kilometers (to Sun Moon Mountain). The mountains and rivers are long, the slopes are steep and the terrain is dangerous. It has been known as the "sea Tibetan throat" since ancient times. On both sides of the canyon, the mountains are Cui Wei, the bees stand, the mountains are facing each other, and the cliffs are thousands of miles away. There is really a trend of "one husband is a Guan, a millionfu is not open". The mountains are stretched, the forest is long, and the forest is long. Wuyuan County is located at the junction of Haizang Tongyu and Qinghai Provincial Agriculture and Animal Husbandry Area. The old county town, once a gathering place for tea-horse exchange and daily groceries, played an important role in communicating Tibet and the mainland, strengthening the relationship between the Han, Tibetan, Hui and Mongolian peoples, and thriving the agricultural and animal husbandry economy. Qingjiaqing and Daoguang period, is the most prosperous period of trade, merchants gathered, foreign goods, camel bells, cattle sound, extremely lively, known as Qinghai Plateau of "Little Beijing".