Introduction to Heilong Waterfall: Heilong Spring sings joyfully all the way, and when it comes here, the water flows down into the pool, creating sparkling waves, just like an Oolong playing in the water. The carbonate calcifications on both sides of the waterfall form mirrors, and the water in the middle forms a trough. This waterfall is about 16 meters high and the pool below is about 9 meters deep.