Located in Bo Trach district (Quang Binh province), 500 km south of Hanoi, Phong Nha- Ke Bang is a treasure of north-central Vietnam. This is the oldest and most complex karst region in Southeast Asia. In 2003, the park was recognized as UNESCO World Heritage Site for enormous geological and biodiversity values.
Phong Nha-Ke Bang covers more than 85,000 hectares of forests, rivers and karst structures. Among its 300 caves and grottos, only 20 have been surveyed. Notably, the most beautiful cave, Phong Nha, is considered one of world’s top caves. It holds several records for the highest and longest cave, the longest underground river, finest beaches inside and the most splendid stalagmites and stalactites.
Before the discovery of the cave Son Doong, the world's largest cave in 2009 by a team of Vietnamese and British explorers, the park held another record: the longest underground river in the world! With this recent discovery, the total length of the network of caverns and caves is estimated at 126 km!
A part from the unique system of illuminated caves and grottos, the park also boasts a number of spectacular rivers, streams and waterfalls such as Gio Waterfall, Madame Loan Waterfall, Moc Stream and Tra Ang Stream. Two main rivers are Son and Chay, by which most of the caves are shaped. Son River gracefully runs a long way before flowing into the mouth of Phong Nha Cave and keeps underground for another several kilometers. Chay River offers more adventures as you boat upward it to explore primitive forests. Here, you will have some delightful discoveries: the impressive Chai Waterfall, the Bull Field, the Surfacing Stream and especially the odd Nuoc Ngang, a spring does not run vertically but horizontally. There are also dozens of limestone mountains in Phong Nha-Ke Bang area. Co Rilata Peak and Co Preu Peak are the two highest peaks with over 1,000 km heights, ideal for adventurous climbers.