Introduction to Tongtian River: Tongtian River is a grand canyon in the shape of a "V". Some valley sections are mountain valleys with nearly vertical slopes. The bottom of the entire canyon is covered with rocks of varying sizes. Smooth as eggs washed away by running water, it is called Tianhe Stonehenge. The Tongtian River flows all year round, rapidly in summer and autumn, and slowly in winter and spring. During the dry season, a trickle of water passes through the rocks, with the sound of water flowing everywhere but no trace of water, which is really interesting.