Hidden in Phong Nha-Ke Bang National Park, Son Doong Cave contains the largest known cave passage on Earth by volume, estimated at about 38.5 million cubic meters. Its main chamber runs more than 5 kilometers long and up to 200 meters high, large enough to enclose a 40-story skyscraper.
Record no. MRB-2026-005817
World's Largest Cave Passage by Volume
Reference Record – Not Certified
This record is compiled from publicly available sources for reference. It has not been examined or certified by The Book of World Records.