Introduction to Changgu Stream: There is Yuhua Lake in the valley on the top of Daciyan Mountain. The water flows out from the mouth of the valley. Because of the high mountain and steep slope or because of the large rocks blocking the road, it forms a stream, or rushes down to form a waterfall, or seeps into the rocks to form a stream. The springs may be hidden or obvious, large or small, rapid or slow, twisting and turning all the way to the foot of the mountain, forming a long valley stream with a length of more than 800 meters, a beautiful landscape.