Introduction to Huangdi Spring: Huangdi Spring is located 500 meters east of Huangdi City. It is said to be the place where the Yellow Emperor bathed. Huangdi Spring is also known as Banquan and Alum Water. There are many records in historical books about this ancient spring. "Wei Tu Tu Ji" records: "Zhuolu City is sixty miles southeast of Xialuo City. There is Banquan one mile east of the city, and there is the Huangdi Temple on the spring." "Hanshu Criminal Law Chronicles" says: "Zhuolu was in Shanggu, where it is today There are Banquan Pool and Huangdi Temple. "Taikang Zhi" of Jin Dynasty records: "There is Banquan Spring one mile east of Zhuolu City." Huangdi Spring has many magical features. There are seven springs shaped like the Big Dipper at the bottom of the pool. It is estimated that they originate from a depth of 5,000 meters. They do not freeze in winter, do not rot in summer, do not dry up in long droughts, and do not overflow in floods. The water temperature remains between 12.5-13.4℃ all year round. The water is as dark as ink, and crystal clear when picked up.