Introduction to the underground river: The underground river is located on the lower level. The water flows from north to south, winding in eighteen turns, passing through three beautiful canyons: "Longmen Gorge", "Lianhua Gorge", and "Banana Gorge", the entire length of which is 1400 meters. It passes through the bottom of four mountains. The water surface of the river is calm and the flow speed is slow. The widest point is 10 meters, the narrowest point is only 1.6 meters, and the water depth is 1-7 meters. Both sides of the river are covered with stalactites, quartz, stone pillars, Stone flowers, stone curtains, etc. come in various forms, including flying elephants crossing the river, birds pecking insects, eight immortals crossing the sea, lions on lotuses, underground dragon palace, sea lions welcoming guests and other stone scenes.