Phong Nha – Ke Bang National Park - is a national park in Quang Binh province in central Vietnam with an area of 885 km². The National Park has the oldest karst mountains in Asia, which has formed about 400 million years ago. There are hundreds of caves, underground rivers and long underground passages with stalactites and stalagmites. In 2005 the park has been discovered a new species of gecko. The park has about 300 caves and caverns with a total length of 70 km. British and Vietnamese scientists have examined 20 km. There are many underground rivers, streams and waterfalls in the park. Phong Nha - Ke Bang included on the UNESCO World Heritage List. Serious exploration of the caves began only in the 1990s when it first Cavers forced deep into Phong Nha Cave, one of the longest cave systems in the world. Paradise Cave was discovered in 2005, and in 2009 a team found the world's largest cave - the Son Doong. In 2015, the public was given access to two cave systems. Serious exploration of the caves began only in the 1990s when it first Cavers forced deep into Phong Nha Cave, one of the longest cave systems in the world. Paradise Cave was discovered in 2005, and in 2009 a team found the world's largest cave - the Son Doong. In 2015, the public was given access to two cave systems. https://www.vietnamsite.nl/phongnhakeeng.htm