Besides the grotto and cave systems, Phong Nha has the longest underground rivers, the largest caverns and passageways, the widest and prettiest sand banks, and the most astonishing rock formations in the world.
According to initial statistics, the primitive tropical forest in Phong Nha-Ke Bang houses 140 families, 427 branches, and 751 species of high-rated plants, of which 36 species are endangered and listed in the Viet Nam Red Book. The forest is also home to 32 sets, 98 families, 256 races and 381 species of four land backboned animals. Sixty-six animal species are listed in the Viet Nam Red Book and 23 other species in the World Red Book. In general, Phong Nha-Ke Bang's animals are more diverse than in other natural reserves and national parks.

Phong Nha-Ke Bang also boasts dozens of mountain peaks of over 1,000 metres still unexplored by men and seen as ideal sites for activities like climbing and exploration. Worthy of note are Peak Co Rilata with the height of 1,128 m and Peak Co Preu, 1,213m. Lying between these peaks are valleys which promise tourists exciting eco-tours.

In addition to the diversity in the ecosystem, Phong Nha-Ke Bang is home to archeological and historical relics, such as an ancient hieroglyphic script of the Cham ethnic minority, King Ham Nghi's base built for the resistance war against French colonialists in the late 19th century, and the Xuan Son ferry station, Ho Chi Minh Trail and Road 20 used during the US resistance war.