Tags: Cave.
Tenglong Cave (Chinese: 腾龙洞; literally soaring dragon cave) is a cave located 6.8 km (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 m (243 ft) and 64 m (210 ft) wide leading to 59.8 km (37.2 mi) of passageways. An underground network of streams runs for 16.8 km (10.4 mi) whilst the cave is the source of the Qingjiang River.