Huangyuan, historically known as "Dangar", is located on the North Bank of the Yellow River, east of Qinghai Lake, the source of Huangshui, surrounded by Datong Mountain, Riyue Mountain and Huashi Mountain, with an elevation of 240-4 898 meters. The relative elevation difference is 28m. The Huangshui River runs through the northern part of the county from the northwest to the southeast. The largest tributary, Yaoshui River, runs from the south to the north. The two rivers divide the source of Huangshui into narrow "Ding" shaped valleys. Xishixia, Bayan Gorge and Yaoshui Gorge. The whole gorge is covered with mountains, rocks and rocks, rivers and picturesque scenery. Huangyuan Gorge, because of its dangerous terrain, has been known as "the throat of sea Tibet" since ancient times. The old county town of Huangyuan used to be a gathering place for Tea-Horse exchanges and daily groceries. It played an important role in communicating Tibet with the mainland, strengthening the relations among Han, Tibetan, Hui and Mongolian nationalities, and prospering the agriculture and animal husbandry economy. Nowadays, with the sustainable development of Qinghai's social economy, Huangyuan Gorge, a traffic fortress, has a very important practical significance for promoting national unity and promoting the economic, cultural and social development of Qinghai-Tibet region, and ensuring the smooth highway has become the bounden duty of highway people.