The principal part of the A’lu Ancient Cave is made up of the Luyuan Cave, the Yuzhu Cave, the Biyu Cave and the Yusun River. The three caves and one river are more than 3,000 meters long. The scenery in the cave has the characteristics of being ancient, strange, and unique. There is spring outside cave; there is cave in cave; there is sky in cave; there is river under cave. In additional, there are all kinds of stalagmites, stalactites, stelae, stone waterfalls, stone flowers and so on. They are formed in various natural styles, such as, “ Male Lion Howling”, “ Lotus Hung Inversely”, “ Flying Dragon Playing Waterfall”, “ Three Elephants Running Quickly in the Plain”, “ Old Tortoise Enjoying the Moon”, “Crocodile in the Air”, “Rhinoceros Going to Sea”, “ Natural Fresco”, “ The King of Wei Country Appointing Soldier”, “ Lofty Jade Pole”, “ Nine Dragons Going to Sea”, “ A’xi Jumping to the Moon”, etc.. They are all vivid. They display the infinite pleasure of nature. At the place which is 15 meters down the Yuzhu Cave, there is a Yusun River. It’s more than 800 meters long. It’s rare in the world. The river is clear. It flows slowly all the year around. In the deep underground palace, stalagmites take on all kinds of shapes, such as, the shape of the lotus,the shpe of the pen, the shape of marquee, fastigiate ahape, laminar shape, filamentary shape, curly shape, etc.. Some grow in clumps, some grow in flakes. They are all the masterpieces of nature. The “Underwater Stalagmite” is called one wonder of the cave. There are some rare fishes like the Dark Red Transparent Fish. They add more mystery to the Yusun River. The surface of the river is clear and flat like a mirror. All the things around are reflected in the river. Either beyond the river or below the river are all scenes When people boat, it seems that they were in the picture and entered a fairyland.