The Millennium Arch Dam Tongji is the world's first arched dam. It was built in the Xiaoliang Tianjian Period of the Southern Dynasties. It has a history of more than 1,500 years and is the oldest large-scale water conservancy project in Zhejiang Province. Yan, Zheng Guoqu and Lingqu are also known as the five major water conservancy projects in ancient China. They have been included in the national key cultural relics protection units and the world irrigation project heritage. The dam is a water conservancy project with drainage and drainage, which is 275 meters long, 25 meters wide and 2.5 meters high. The whole is arched and arched. This design lengthens the dam and reduces the impact of water flow. force. Continue to go forward, there is bamboo rafting, visitors can watch the scenery on both sides of the river.