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Fengyu Cave has an entire length 5.3 kilometers and a subterranean river of 4.1 km. The underground river is inhabited by the Fengyu (blind red fish).
The subterranean river descends from a surface stream, 3 km away from the Fengyu Cave entrance, that originates from the southern sandstone Dayao Mountains. The river enters the cave between a boundary of sandstone and Devonian limestone. The Shanhe River , a tributary of the Lipu River, recharges the subterranean river by karst fissures, increasing the discharge in small increments. As a seasonal river, the Shanhe is flooded in the summer and almost dry in the winter. Sinkholes on the surface also recharge the subterranean river.
The cave is 5.3 km long, running through nine mountains with one hall being as large as 25,500 sq meters. It is said to be The No. 1 Cave in Asia .
This cave can be explored by a combination of land, water and air. The land section is a 2 km long tour revealing stalactites, stalagmites, stone curtains and stone pillars. The water part is an underground river drift into the mysterious cave. This part is about 3.3 kms long with numerous bizarre rocks on riverbanks, some are shaped like birds and animals. The air section is a 1.8 km long overhead railway. It connects the entrance and the exit of the cave and gives a birds eye view of the surrounding country-side.