Introduction to Shimen Lake: About one kilometer southwest of Dajing Town, there are cliffs and walls, standing like a gate. The runoff of Shimentan in the upper reaches is hundreds of twists and turns, and it gathers here to form a huge pool. The pool is more than 400 meters long, more than 100 meters wide, and more than 30 meters deep. It is the largest pool in Yandang.