Introduction to Xieyue Zhenyun: There are four characters "Xieyue Zhenyun" engraved next to the water curtain cave. Every summer night, the bright moon shines on the waterfall. The moonlight in the sky is like running water, and the running water on the ground is like moonlight. Moonlight , flowing water merge into one, this waterfall is like silver moonlight pouring down from the sky, this is called "Xie Yue".