The Phong Nha – Ke Bang National Park extends about 85,754 hectares and is known for its Karst formation, aquatic and terrestrial habitats, tropical dense forests, forests, caves, and savannah land.
The most significant attraction at this park is the karst formation and the caves that hold it. Popularly known as the Phong Nha cave, it consists of a network of over 104 kilometres of caves and rivers that run underground making it the most incredible ecosystem of limestone and karst that exists in the world. It is known as the oldest karst formation as it had evolved since 400 million years ago, going back to the Palaeozonic Period. 
This karst landscape is very complex due to the geological changes that had taken place for so many millions of years, and therefore affords the most spectacular sights. The caves are truly interesting for those keen on the subject of geology due to the complex rock formations and the various geomorphic features. The geo-diversity here is also rather high, making it a very interesting study. But even for the layman the simple beauty of the caves plus the fact that the rock formation here represents millions of years of geological changes is significant enough to make it an interesting place to explore. 
There are various types of caves here including terraced, dry and suspended caves. Out of all the sites, Phong Nha is the most famous due to its length and also the ability to accommodate tour boats that can go up to 1,500 metres inside. 
There is also a large variety of flora and fauna to be explored at this park, including 113 mammals, 302 birds, 81 amphibians and reptiles, and 72 types of fish. There is also a significant amount of endemic species at the Phong Nha – Ke Bang National Park.
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