Phong Nha Ke Bang, the World Heritage site, is the largest natural reserve in Vietnam, 84 percent of its total area is covered with the tropical moist primeval forest on limestone . The  features of the park is  the richest biodiversity in Vietnam. Especially, 28 new species have been found here recently, including 25 animal species and three plant species of which   2 narrow endemic species  only exist in Phong Nha - Ke Bang .

The high biodiversity of fauna is proved with the existence of 464 species of  invertebrate  and  825 species of vertebrate belonging to 489 genus, 151 families and 40 orders. Three of the newly discovered animals are  amphibian species (Ichthyophis chaloensis orlov, Rhacophorus orlovi, Gracixalus quyeti)  and another 15 are reptiles (Cyrtodactylus phongnhakebangensis, Viridovipera truongsonensis, Gekko scientiadvantura, Boiga bourreti, Tropidophorus noggei, Calamaria thanhi, Sphenomorphus tetradactylus, Amphiesma andreae, Cuora cyclornata, Lygosoma boehmei,  Cyrtodactylus cryptus, Amphiesma leucomystax,imbrios smithi, Lycodon ruhstrati abditus, Cyrtodactylus roesleri.). The park is habitat of two new bird species (Pycnonotus hualon, Phylloscopus calciatilis). Five new species of arachnids consist of  Paradise scorpions (Vietbocap thienduongensis) Vietnam scorpions (Vietbocap canhi sp.n.), and other three spider species (Pholcus bifidus sp.nov., Pholcus caecus sp.nov. Khorata protumida sp.nov.)

 The park is home to 2,935 species of flora which are in 1,002 families and 198 genus. Three newly discovered species are important to global science (Begonia vietnamensis, Aristolochia quangbinhensis Do, Mallotus phongnhaensis). Particularly, a population of limestone conifers (Calocedrus rupestris) are  endemic species which currently exist  in the limestone mountains of Phong Nha –Ke Bang. On the other hand, the existence of Oligoceras genus which are rare and precious species recently discovered in the forest.

 With the scientific evidence as mentioned above, Phong Nha – Ke Bang is arguably the most biologically diverse region in Vietnam and among the richest natural heritage sites on the planet. The park is considered as the most plenty of  the newly-recorded species in the first decade of the 21st century.