World Record Title: The world's longest subsurface stream: Dragon Bridge river
World Record Creator: Dragon Bridge river
World Record Holder: Dragon Bridge river
World Record Field: River
World Record Rules: River; Total length: 50 kilometers.
World Record Number: 20121000020
World Record Validity Period: Until the world record was broken.
World Record Witness: Carrying the Flag World Records certifier 006
World Records Source: World record database of Carrying the Flag
Awarding Certificate Date: October 2, 2012
World Record Details:

     The world's longest underground river: Dragon Bridge river. Total length of 50 km. River (subsurface stream) is also called "underground stream", referring to the river below ground, is an underground karst topography is determined by groundwater collection, or surface water into the ground along the underground rock fractures through rock dissolution, collapse, and water handling and the formation of the underground river. Mainly in the Karst (Karst) growth medium formed. It is often exported without entrance. Hot and rainy tropical and sub-tropical climate most conducive to the formation of river. The spatial distribution of river by lithology, geological structure and drainage control plane. Fold in the formation of shaft portion, fissures and fracture site, can not be the same lava lava at the contact and develop normally near the river drainage plane. River has its own recharge, runoff and drainage system. The river also forms a large underground river. Underground river system developed mainly along the tectonic fracture plane. Underground rivers and underground stream is an important source of water in karst regions. Some underground river has great traffic.