largest cave in the world
In pictures: Inside Hang Son Doong, the world's largest caves in Vietnam MORE... Picture: John Spies/Barcroft Media. At more than 200m high, 150m wide and 5km long, the Hang Son Doong cave in Vietnam is so big it has its own river, jungle and climate. Australian photographer John Spies, 59, spent a week photographing the natural wonder of the cave system.