It is the third largest river in Wansheng, flowing 23.1 kilometers within the district. The river covers an area of 83.4 square kilometers, and has an average flow of 3.01 cubic meters per second. With lifting of the earth's crust and strong undercutting of the flow, the river valley gradually formed a V shape. In addition, the river is abounding in carps, and is consequently named as Carp Lake.