Is Yantai Cishan Hot Spring natural?

This is natural. Yantai Cishan Hot Spring is natural because it is formed by high-temperature hot spring water seeping from cracks in the earth's crust. These hot springs are known as natural hot springs because of their high temperature, many unique chemical components and strong skin care effect. Cishan Hot Spring is a national AAAA-level tourist attraction, located in the center of Yantai Cishan Provincial Geopark, with the Yellow Sea in the north, Penglai in the west and Yantai downtown in the east.