Introduction to the water cave: The water cave, also known as the back cave, is an extremely ancient underground stream, about 120 meters long and 4.5 meters deep. Boating in the water cave is an indispensable thing when traveling here. "The boat is sailing in the water, and the oars are propped up in the sky." The sky dominates the sky, twists and turns, and the strange natural shapes, coupled with colored lights, will make you contemplate and feel relaxed and happy.