Quang Binh, whose capital city is Dong Hoi, is 491km from Hanoi in the North and 166km from Hue in the South with easy traffic. This province is famous for its coasts dotted with white sandy beaches and the famous cavern, Phong Nha, composed of 14 tunnels created by the underground river by dissolving the limestone mountain Ke Bang. The Geographical Association of the U.K Royalty granted Phong Nha as one of the most beautiful cavern in the world.

Phong Nha Cavern, 50km northwest of Dong Hoi, is 7,729m in length, composed of 14 tunnels created by the underground river by dissolving the limestone mountain Ke Bang. It is divided into two parts: the Dry Cave & the Wet Cave. A few years ago, a group of explorers from the Geographical and geological faculty of the Geographical Association of the UK Royalty, together with the Geographical and geological faculty of the Natural Science University of Ha Noi have examined and recognized the 7 supremacies of Phong Nha Cavern:
- The longest water tunnels
- The highest and widest entrance
- The most beautiful sandy strip
- The most beautiful underground pool
- The most splendid and miraculous stalagmites
- The longest underground river
- The biggest swallow-tern cave