Tien Son Cave – A Heavenly Paradise

Tien Son Cave is located halfway up the mountain, approximately 100 meters vertically above Phong Nha Cave. It is known as a “heavenly paradise” or “celestial palace” due to its magnificent natural beauty. Tien Son Cave is 980 meters long. About 400 meters from the entrance, there is a deep chasm approximately 10 meters deep, followed by an underground rocky passage stretching nearly 500 meters. Due to the challenging and potentially dangerous terrain, visitors are currently permitted to explore only up to approximately 400 meters from the cave entrance. According to scientists from the British Cave Research Association (BCRA), Tien Son Cave was formed tens of millions of years ago when a flowing stream gradually carved through and eroded the limestone mountains of Ke Bang. Later, geological movements caused the mountain mass to rise or sink, resulting in rock formations collapsing and blocking the original watercourse. This process created Tien Son Cave above, while the underground river continued to flow through the lower section, forming Phong Nha Cave.