Phong Nha – Ke Bang National Park is in Quang Binh Province – the central Viet Nam. Covering an area of more than 343,000 hectares. It has been declared a world natural heritage by UNESCO twice in July 2003 and July 2015.
Scientists compare Phong Nha – Ke Bang as a huge geological museum thanks to its complicated geological structure with different categories of stone.
Besides the historical value of topography, geology, geomorphology, Phong Nha – Ke Bang is also blessed with the mysterious and majestic landscapes by nature. The Phong Nha – Ke Bang Natural Park still hides various myths of nature. It also has spectacular karst caves formed for hundreds of millions of years.
Locating in the area with a high average rainfall, however, not many rivers and streams can be seen because water is absorbed to run inside limestone mountains. Therefore over tens of million years, water has eroded rocks, creating numerous caves in the area. Phong Nha – Ke Bang area is famous for its cave and grotto systems as it comprises about 300 caves and grottos, divided into three main systems: Phong Nha Grottos, Vom Caves, and Ruc Mon Caves.
Some typical caves and grottoes in Phong Nha – Ke Bang are Phong Nha, Tien Son and Thien Duong grottoes, Toi, En and Khe Ry caves. Especially, Son Doong Cave is considered as the largest cave in the world with 200m in height, 200m in width, at least 8.5km in length.
With its characteristics of topography, climate, soil and hydrography, Phong Nha – Ke Bang boasts a rich, diversified and unique flora. Investigations show that Phong Nha – Ke Bang has a large tropical forest floor. It covers 94 percent of the natural area, of which nearly 83 percent is covered by primeval forests. The diversity of rare and precious species of animals and plants in Phong Nha – Ke Bang is corollary of its natural conditions, and is a feature of the forest ecosystem.
Statistics show that the flora of Phong Nha – Ke Bang has 876 species of plants and 525 species of animals , of which many rare and precious species are listed in Viet Nam’s Red Book and IUCN’s Red Book (International Union for Conservation of Nature and Natural Resources). Phong Nha – Ke Bang is considered a huge biological museum in Viet Nam.