The formation of Jiulian Cave was about 70 million years ago, and it was a floating mountain system. The whole cave can be divided into four parts in turn: the Great Hall, the front cave, the second hall, and the back cave. The Great Hall is in a kiln shape, if it is circled from the front cave. A bird's eye view of the Great Hall, the front cave is more than 100 meters long, and the road is twisty. Jiuliandong mouth is like a dough, the outside is narrow and the inside is wide, forming multiple holes in the hole, hole set cave, pool water piercing hole, hole in the hole, hole in the hole, hole in the hole, hole in the pool week. Really good.