Introduction to "Fushan Yuelang": "Fushan Yuelang" is a geological wonder that "reveals the bottom of the Yellow River". "Shaanxi Provincial Chronicle" records: "Feifu Mountain is forty miles east of Heyang County." "Kang Yuezhai Xingzhuang" collected by Heyang County Museum records how some people went to the Yellow River to explore "Feifu Mountain".