Introduction to Guanyan Underground River: "Guanyan" is named because its mountain shape resembles the purple gold crown of an ancient emperor. It has a thousand-year human history. Xu Xiake of the Ming Dynasty visited Guanyan Cave twice and detailed it in his travel notes. According to records, he is recognized by later generations as the first caver of Guanyan. The interior of Guanyan Cave is exquisitely carved and full of shapes. Outside the cave is the uncanny workmanship of strange peaks and rocks, which are amazing and breathtaking. There are also sightseeing elevators, canyon trains, underground river canoes and other tourist ways, which are full of fun.