Tongjixuan, the main attraction of the scenic spot of Shantou Scenic Area, an ancient painting township. Built in 505 AD, Tongjixuan is a large-scale water conservancy hub project famous for Dujiangyan. Dam + dry canals + 48 branch canals + 321 Mao canals, irrigating countless good fields downstream, benefiting countless people for generations. In Shantou Scenic Area, you can visit the Tongjiqi Dam and a dry canal. The arc-arched Tongjiqi Dam across Songyin Creek is 275 meters long, 25 meters wide and7.5 meters high. It is the earliest arched dam built in the world. Walking on the dam side of the canal, the arc-shaped dam is like a sparkling silver chain tied to the Songyin River, the level behind the dam is like a mirror, the waves in front of the dam are rolling, and the pavilion next to the dam is elegant and quiet; The clear dry canals are like straight avenues leading to the distance, the streams in the canals are microwaved, and the huge lychees on the shore are simple and beautiful.