Introduction to the underground river: Due to the volcanic eruption in Tianmen Mountain, the two mountains were crowded into a sky bridge, and because the river has been rushing for thousands of years, an underground river about 70 meters long rushed out. The stalactites formed on the rock wall after tens of thousands of years The natural "Guanyin" and "Maitreya" are superb and lifelike, as well as the gourd waterfall "carved" by the mountains and flowing water, which can be called a wonder for thousands of years.