Located in the east of Tian'anmen Gate and opened in 2002, also known as Jinshui River, it is named for Acorus calamus. The Acorus calamus River originates from the West Garden Zhonghai of Huangcheng City, flows through Tian'anmen Gate, and then along the north side of the south wall of Huangcheng, it has beautiful scenery, convenient transportation and free play.