Inside Hang Son Doong, the world's largest caves in Vietnam

 

 

 

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. "With ceilings towering over 200 metres high in places, the cave is a humbling and belittling experience," said John, who has lived in Thailand since 1977 and runs the Cave Lodge guesthouse.