Introduction to Shililongtrough: After the Yellow River water rushes down from the mouth of the Hukou, it flows to the bottom of the canyon with a huge flow of thousands of cubic meters per second, a trench 30-50 meters wide and 10-20 meters deep. Because it is said that it was carved from the body of a dragon, it was named "Ten Miles Dragon Groove", also known as "Ten Miles Dragon Trench". "Dry land boating" utilizes the geology and landforms of the original river bed next to the trough.