Son Doong Cave

Son Doong Cave is the world's largest natural cave, located in Phong Nha-Ke Bang National Park in Bo Trach District, Quang Tri Province, central Vietnam. Formed 2-5 million years ago on the border of Laos and Vietnam, it measures over 9 kilometers long with chambers large enough to house a city block. Notable for its massive dolines, underground river, jungle and unique ecosystem, it was first fully surveyed in 2009 and opened for limited guided expeditions.

Visitors can expect a multi-day guided expedition inside a vast cave system within Phong Nha-Ke Bang National Park. The experience involves trekking through jungle and rivers to reach the cave entrance, exploring enormous chambers up to 200 meters high, viewing stalagmites up to 80 meters tall, two large dolines with sunlight and jungle growth, an underground river, campsites inside the cave, and unique formations. Access is only with an authorized tour operator and requires camping inside the cave.

First discovered in 1990 by local resident Ho Khanh, rediscovered in 2008 and fully surveyed in 2009 by the British Cave Research Association. Declared the world's largest cave by volume in 2009. Opened to limited tourism in 2013 under management of Phong Nha-Ke Bang National Park with Oxalis Adventure as the sole authorized operator.