Tag along in this underground world and be astound by how beautiful nature can be. The enormous cave is situated in the Vietnamese national park Phon Nha-Ke Bang, 280 miles south from the countries capital city Hanoi.
In pictures: Inside Hang Son Doong, the world's largest caves in Vietnam
Explore the ancient caves of Hang Son Doong, Vietnam. Hang Son Doong is one of the largest caves in the world and features a fast-flowing underground river. For spelunkers, exploring Hang Son Doong is the equivalent of scaling Mount Everest.
Five times larger than the nearby cave that previously held the record of the largest in Vietnam, Sơn Đoòng was named after the Vietnamese words for “mountain river,” because of its own large, fast-flowing river inside it.