View of Phong Nha-Kẻ Bàng National Park

Phong Nha-Kẻ Bàng (Vietnamese: Vườn quốc gia Phong Nha-Kẻ Bàng) is a national park and UNESCO World Heritage Site in the Bố Trạch and Minh Hóa districts of central Quảng Bình province in north-central Vietnam, about 500 km south of Hanoi. The park borders the Hin Namno Nature Reserve in Khammouan, Laos to the west and 42 km east of the South China Sea from its borderline point. Phong Nha–Kẻ Bàng National Park is situated in a limestone zone of 2,000 km in Vietnamese territory and borders another limestone zone of 2,000 km² of Hin Namno in Laotian territory. The core zone of this national park covers 857.54 km² and a buffer zone of 1,954 km².^[1]

• http://en.wikipedia.org/wiki/Phong Nha-Ke Bang National Park