Tongjixuan, in the innermost scenic spot opposite the ancient painting township river, you need to enter by boat (the cost is included in the big ticket), not only the price is super high, but the scenery is charming. [View] [Fun] [Cost-effective] The world's earliest arch dam is located here. Due to the filtering of the dam, no matter how heavy the rain, no matter how heavy the flood, the river water here has been kept clear.