Tien Son is an area famous Phong Nha-Ke Bang. Door to door Tien Son
Phong Nha is located at an altitude of 1,000 m above sea level about 200 m. Tien
Son length is 980 m. The entrance is about 400 m in depth is 10 m, and then
continue to the reef about 500 m, quite dangerous should not be allowed tourists
to visit the area, but only 400 m distance from the door from work.
This cave was discovered in 1935, initially, local people call it a coin, the beauty of the magical mystery no.Sau called Tien Son cave. Tien Son is the scene where stalactites and stalagmites in any great fanciful as the Phong Nha, but has an identity is the sound emanating from the stones and pillars echoed when typed in as gongs and drums .. According to scientists from the Royal Association British caves, Tien Son was formed millions of years ago, when water flow through a perforated hollow mountain, abrasive Ke Bang limestone. Then, due to tectonic or volcanic mass has been raised, or was brought down in the rocks collapse is done to stop the flow at the top of Tien Son. As part of the underground river flows through creating Phong Nha cave. Although Phong Nha and Tien Son cave adjacent, but not through each other.