Detailed map for 404 caves of Phong Nha cave system created
Detailed map for 404 caves of Phong Nha cave system created Chia sẻ | FaceBookTwitter Email Copy Link Copy link bài viết thành công 14/01/2021 09:23 GMT+7 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....
Source: vietnamnet.vn