Phong Nha Cave

Phong Nha Cave is a major river cave within Phong Nha-Ke Bang National Park in Son Trach Commune, Bo Trach District, Quang Tri Province, central Vietnam. Stretching 7,729 meters with an underground river, it is renowned for extensive stalactites, stalagmites and large chambers. Designated part of the UNESCO World Heritage Site in 2003, it is accessed by boat along the Son River and remains one of Vietnam's most visited natural cave systems.

Visitors reach the cave by motorized boat along the Son River from the Phong Nha tourism wharf, then continue inside by boat and on foot. Inside, they can see a 7.7 km river cave with large chambers, stalactites and stalagmites, underground river passages and soft lighting. The tour includes gliding through the cave entrance, walking on paved paths and viewing illuminated rock formations. Surroundings include karst mountains, jungle of Phong Nha-Ke Bang National Park and the Son River valley.

Phong Nha Cave contains Cham inscriptions dating back centuries and was first scientifically surveyed by the French in 1935. It served as a shelter, storage site and hospital during wartime. It was inscribed as part of Phong Nha-Ke Bang National Park UNESCO World Heritage Site in 2003 for its geological and geomorphological values, with British Cave Research Association surveys documenting its 7,729-meter length.

The cave is a nationally significant natural heritage site and a symbol of Quang Tri/Quang Binh karst landscape. It holds cultural value for local communities and is associated with Cham heritage and local folklore related to the Son River and karst mountains. It is a central attraction of Phong Nha-Ke Bang National Park tourism.