Introduction to Riyue Mountain: Located 40 kilometers southwest of Huangyuan, it is a branch of the Qilian Mountains, 90 kilometers long, with the highest altitude of 4877 meters. It is a natural dam in the east of Qinghai Lake. Riyue Mountain is the place where Princess Wencheng passed by when she entered Tibet. It is a bridge for friendly exchanges between the Han people and ethnic minorities in the Central Plains. Due to its special geographical location, Riyue Mountain has completely different geographical landscapes on the east and west sides.