Phong Nha-Ke Bang park is now the fifth UNESCO recognised site in Viet Nam after Ha Long Bay, the imperial city of Hue, the ancient quarter of Hoi An and the My Son historical site.

Phong Nha-Ke Bang national park, located to the north of the majestic Truong Son range in central Quang Binh province, is one of the world's two largest limestone regions.

The over 200,000 ha of parkland includes beautiful limestone formations, grottoes and caves, and boasts lush forestland covering 95 percent of the park area.       

The area is considered a paradise for researchers and explorers of grottoes and caves, and Vietnamese and British scientists have so far surveyed 20 with a total length of 70km. Of them, 17 are in the Phong Nha area and three in the Ke Bang area.

The Phong Nha cave itself which lends its name to the whole system is probably the most beautiful of all, containing many fascinating rock formations, enchanting visitors with evocative names such as Lion, Fairy Caves, Royal Court and Buddha.

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, 1,213 m. 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.