Phong Nha Cave

Phong Nha Cave is a cave in Phong Nha-Ke Bang National Park, a UNESCO's World Heritage Site in Quang Binh Province, Vietnam. This cave has been recognized the most beautiful one in this national park. This cave is 7,729 m long, contains 14 grottos, with a 13,969 m-long underground river. The scientists have surveyed 44.5 km of grottos in this cave so far, but tourists can only penetrate to a distance of 1500 m.