Dalongtan, located 1 km northeast of Jingxi County, Guangxi Zhuang Autonomous Region, Xuhuanhe Village, Yuweng Scattering Net, at the foot of the stone mountain on the east side, is the source of the Longtan River, and the pool is a rising spring. It is a large underground river exit. The water is inexplicable, the spring water is up, and it becomes a lake. Wide more than 20 mu, ancient water depth of dragon Tibetan, so named Dalongtan, Jingxi eight scenes.