Introduction to Tianquan Cave: Tianquan Cave is the longest cave in China and a famous cave in the Xingwen Shihai Cave Group. It was formed about three million years ago. Its spatial scale and systematic tour length rank first among caves in the world. The main attractions include Yingbin Stone, Qinv Peak, Tianya Wangguiren, Stone Forest Bamboo, Cuiping Ancient Tower, Leaning Tower, Stone Forest Pinnacle, Husband and Wife Peak, Longya Waterfall, etc.