The drive from Pingguo City to Tongtian River takes about an hour and a half, with beautiful scenery along the way. Tongtian River is an underground river, with 3.5 kilometers of the scenic area developed. Visitors can hike along the river inside the cave or take a boat. A better experience is to hike in and exit by boat, or vice versa. The cave stalagmites, pillars, and terraces are not large in scale, but the cave halls are tall and spacious, with caves within caves, sometimes connected by narrow passages, which is quite interesting. The cave is warm in winter and cool in summer, making it a good place to escape the heat.