The tour route of Jiuzhaigou Scenic Area is a Y-shaped one, and the Changhai is at the end of the left. The area of the Changhai Sea is very large. The clear water of the lake reflects the smoky green hills. It seems to have a quiet feeling. The cypress tree on the shore had only branches and leaves on one side and bare on the other. It was very interesting. There is no fixed toilet in Changhai, but there are only a few mobile toilets. How can it be enough? And can we widen the pavement to the colorful pool? It's too crowded for everyone to walk from here.