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Fengyu Cave is located in Shanhe Village, passing through nine karst peaks, 16 kilometers from Lipu county town where 110 km away from Guilin of Guangxi Zhuang Autonomous Region.

Fengyu Cave has a whole length of 5.3 kilometers and a subterranean river course of 4.1 km long. The main cave passage is usually 6-10 m wide and 3-10 m high, with many large chambers and 10 branches.The biggest chamber is more than 25,500 square meters, with a cave height of 36 m.

The subterranean river comes from a surface stream , 3 km away from Fengyu cave entrance, originates from the southern Dayao Mountains which consists of sandstone. The stream heads into underground in the boundary between sandstone and the Devonian limestone.

The surface stream connects Fengyu subterranean river there. From Dongan to Doli, Shanhe River can also recharge the subterranean river by karst fissures and make its water discharge increase gradually. The underground river has a complex structure, with many ceil windows and exits. Besides the streams, Some sinkholes on the surface recharge the subterranean river some water too. The underground river in the cave is about 5-6 m wide, but the water depth and discharge are quite different in different parts.

n Ganghu cave, the first original entrance of Fengyu cave, it is about 0.3 m deep and has a discharge of about 0.5 m3/s , and in the Dabayan cave, exit of the underground river, it is more than 1m deep and has a discharge of 1.6 m3/s. By the way, there is a plenty of red Fengyu fish in the underground river, and the cave takes its name from the fish.