Phong Nha-Ke Bang National Park is a district in Bo Trach and Minh Hoa, Quang Binh, Dong Hoi City and about 50 km to the northwest, the capital, Hanoi about 500 km south of . The park borders the nature reserve Namno Hin Khammouan Province, Laos to the west, the South China Sea about 42 km east from the border of two countries.
Phong Nha-Ke Bang National Park is situated in a limestone area covering about 200,000 ha of the territory of Vietnam, Laos area adjacent to national parks is also an area of about 200,000 ha limestone. The core area of national parks is 85,754 ha and 195,400 ha a wide buffer zone. The park is set up to protect one of the world's largest carxto with about 300 caves and ecosystem conservation in the North Truong Son North Central region of Vietnam. Characteristic of this national park is the creation of limestone, 300 caves, underground rivers and rare flora and fauna in Vietnam Red Book and Red Book World. The caves here have a total length of more than 80 km but the British cave explorers and adventurers Vietnam is only 20 km, of which 17 km in area and 3 km in Phong Nha Ke Bang area.
April 2009, an expedition of the Association of the British Royal Cave was discovered and published Son Doong cave is a large cave in the world (over five kilometers long, 200m high and 150m wide), much larger than Deer Cave in Gunung Mulu National Park in Sarawak, Malaysia, larger than 4 to 5 times the Phong Nha. In this survey, the expedition also found several other caves.
Tectonics of the National Park carxto Phong Nha-Ke Bang is formed 400 million years ago, from the Great Neck Student carxto so is the oldest in Asia.
Over many major changes in stratigraphy and geomorphology, topography of this area is very complex. Phong Nha-Ke Bang show dramatic evidence of Earth's history, helped historians understand the geological history and topography of the area. Area Phong Nha-Ke Bang is probably one of the distinct patterns of the most beautiful and complex tectonic carxto in Southeast Asia. To be recognized as a UNESCO World Heritage criteria geological, geomorphological, 2003, Phong Nha-Ke Bang also was nominated for the 2nd UNESCO Heritage Site is the world's biodiversity criteria Study on 06/29/2011.
Cave system

National Park, Phong Nha-Ke Bang is one of the two largest limestone regions in the world. Compared with 41 other world heritage carxto, Phong Nha-Ke Bang is the terrain conditions, geomorphological and biological differences. Carxto here dating from the Great Neck Student, 400 million years ago, so the Phong Nha-Ke Bang is the oldest major carxto Asia. If Namno Hin area, a nature conservation area of Kham Muon province, Laos, bordering Phong Nha-Ke Bang National Park to the west are combined into a continuous protected area, the conservation area will be the carxto forests exist in Southeast Asia's largest with an area of 317,754 ha.

In Phong Nha-Ke Bang has a network of about 300 large and small caves. system was the Phong Nha Cave Research Association British Crown (BCRA) to evaluate the worth cave leading to the fourth point: has the longest underground river, is high and largest store, wide, sandy beaches and most beautiful, most beautiful stalactites.

Compared with three other national parks have been recognized by UNESCO as World Heritage in Southeast Asia (Gunung Mulu National Park in Malaysia, National Park Puerto Princesa underground river in Palawan in the Philippines and Lorentz National Park in West Irian of Indonesia) and some other areas carxto in Thailand, China, Papua New Guinea, the National Park carxto Phong Nha-Ke Bang with older age, geological structure and complex underground river system has and more complex forms.