Accordingly, the project, worth US$4 billion, will include a casino area, hotels and urban facilities on the mountains, providing outdoor entertainment activities and cave exploring tours in Phong Nha-Ke Bang.
The Phong Nha-Ke Bang National Park was listed in UNESCO World Heritage Sites in 2003, thanks to its system of 300 caves and grottos with a total length of 126 km discovered up to April 2009.
Before the discovery of the Son Doong, recognized as the world's largest cave, Phong Nha held several world cave records, as it has the longest underground river, as well as the largest caverns and passageways.
(Source: Govt. Web Portal)