The cave system contains the longest underground river globally, extending for nearly 14 kilometers.
Ancient Champa inscriptions are carved into the cave walls, dating back as far as the 11th century.
Phong Nha was used as a hospital and ammunition depot during the Vietnam War.
The name 'Phong Nha' translates to 'Wind and Teeth', referring to the stalactites resembling teeth and the wind blowing through them.
British cave explorers first mapped the system in 1990, revealing its massive scale.
The cave contains a unique subterranean ecosystem including blind fish and translucent shrimp.
Phong Nha Cave is a river cave located within the Phong Nha-Ke Bang National Park in central Vietnam. It serves as the primary attraction of a UNESCO World Heritage site known for its ancient karst geography dating back to the Paleozoic era. The cave is accessed exclusively by dragon boats traveling up the Son River. It features a massive underground river system and extensive stalactite and stalagmite formations. The cave system spans nearly 8 kilometers in total length, though tourist access is restricted to the first 1.5 kilometers. It holds the record for the highest and longest underground river in the world. The interior contains subterranean chambers accessible only by boat, maintaining a consistently cool climate year-round. It is considered the most accessible of the many caves in the Ke Bang limestone massif.
The entrance of the cave where the daylight meets the dark limestone archway, visible from the boat.
Bring a light waterproof jacket, as temperatures inside the cave are significantly cooler than outside.
Ensure you carry a dry bag for camera equipment and electronics due to the boat journey.
Visit on a weekday morning to minimize boat traffic and noise within the cave chambers.
Do not attempt to swim in the cave interior; only exit the boat at designated wooden platforms.
Operations may be suspended during the peak flood season, typically late autumn (October-November), when high river levels make navigation unsafe.
Avoid touching the stalactites as skin oils inhibit their growth; maintain a quiet voice to respect the cave's acoustics.
