Introduction to Laolong Cave: Laolong Cave is located in the southeast of the main peak. The entrance to the cave is horizontal, with the four characters "Song Jie Long Yuan" engraved on it. The entrance to the cave is vertical and engraved with the four characters "Body fluid and ambergris saliva". There are three springs in the cave, in which smoke and clouds appear and rise. The tide rises twice a day at noon and at midnight, so it is called "Ziwu Spring".