Tenglong Cave (literally "soaring dragon cave") is a cave located 6.8 kilometres (4.2 mi) from Lichuan City, Hubei, China. It is believed to be the longest monomer karst cave system in the world. The cave entrance is 74 metres (243 ft) and 64 metres (210 ft) wide, leading to 59.8 kilometres (37.2 mi) of passageways. An underground network of streams runs for 16.8 kilometres (10.4 mi) whilst the cave is the source of the Qingjiang River. Year round temperatures underground remain in the 16¨C18 degrees Celsius range.
The Tenglong Cave Group is a cave cluster, with the Dry Cave and Water Cave as its main scenes.
The Dry Cave is about 52 kilometers' long, and its mouth is 74 meters heigh and 64 meters wide, the largest dry cave in Asia.
The Water Cave sucks in water from Qingjiang River, which forms a waterfall like a crouching dragon swallowing. The river is a 16.8km-long underground stream. Amazingly, a single wall separates the two caves.
Tenglong Cave has been confirmed by domestic and foreign experts as the biggest water-eroded cave in China and one of the special-class caves in the world.
The scenic spots are distributed across an area of 2,000,000 square meters. These include the White Jade Stone Forest, Thousand Buddha Palace, Dragon Palace, Pearl Blanket, Flower Spring Water and the "Crouching Dragon Swallowing the River" Waterfall in the Falling Water Cave. At the waterfall, the river becomes an underground stream on which visitors can view the sights on a boat.