Introduction to Donglongkou: Donggu, commonly known as "Donglongkou", is located on the east side of the central building complex. It is quiet and deep, with towering ancient trees, streams and lakes, cool and refreshing. At the end of the valley, there are cliffs that cannot be looked up at. Under the west corridor At the bottom, there is spring water flowing out or dripping from the cliff. The water splashes and the rocks ring, symphony day and night. This is the "Five Spring Waterfall" known as one of the "Ten Scenic Spots of Jincheng".