Jianshui Swallow Cave is located in the valley of Lujiang River, more than 20 kilometers east of Jianshui County, Honghe Hani and Yi Autonomous Prefecture, Yunnan Province. The cave is divided into two layers: the upper cave is huge, the opening is a collapsed water cave, and the interior is a hall-shaped cave with clusters of stalagmites, stalagmites and stalactites. There was a three-story pavilion inside the cave, and a tree passed through the building, which was called an arrow through three buildings, but was later destroyed; the lower cave is more than ten feet high, with dense stalactites at the top, and the dark river section of the Lu River flowing into the cave is seven or eight kilometers long. The cave is shady and has many swallows inhabiting it, hence the name Swallow Cave. There are many peach and plum trees outside the cave, and the flowers bloom in spring, adding color to the cave. In summer, it is cool and refreshing to enter the cave; in winter, it is warm and full of air, which is also a feature of Swallow Cave. After the dam was built on the outflow of Hujiang River, it entered the limestone mountains, and the river appeared and disappeared, forming numerous underground caves, dark rivers and surface rivers alternating with each other.