At the junction of Bajiao Township and Yeliguan Township in Lintan County, there is a mountain lake, called Yehai, which is also known as Changye Pool. The lake has a total area of 750 acres and is located in a mountain gorge at an altitude of 2610 meters. The water source is injected from the Shimen River in Bajiao Township. There is no exit, and underground undercurrent flows from the mountainside in the northern part of Yeliguan Township. The lake is dark green, clear as a mirror, the water level is not reduced, the big water does not overflow, there is a small dragonfly (locally called a baby fish) in the shallow water of the lake, there is no other aquatic animals. The local people have regarded this lake as a holy lake since ancient times, and worshipped the vicissitudes of life in awe, and cast copper coins and silver coins into the lake water to test their heartfelt or not.