Cave Hang-Yong (Hang En Cave), Vietnam

Cave Hang-Yong (Hang En Cave), Vietnam Going deeper, travelers get to Hang-Yong, cave created by Rao Thuong River (Rao Thuong). Turning into a series of ponds in the dry months, the level of the river can reach 300 feet (91 meters) in the flood season, covering the rocks, which are cavers.

Source: mirfactov.com/