Detailed map for 404 caves of Phong Nha cave system created
After some 30 years of research, experts from the British Royal Caves Association (BCRA) has created a detailed map for 404 caves that have staggering length of 231km in Phong Nha-Ke Bang National Park in Quang Binh Province in the North Central region, said the park’s director Pham Hong Thai.