Introduction to the Yin and Yang Realm: are two connected stone waterfalls with completely different colors. One is white and the other is black. This phenomenon is caused by the flaky water flow caused by dripping water from the top of the cave. The light-colored stone waterfall Mainly because it is far away from the surface, the water flow with sediment has been well filtered and contains less impurities; while the dark stone waterfall is far away from the surface, and the impurities are formed during the flow of water at the bottom of the cave. Formed by heavy sedimentation.