Hang Son Doong, the world's largest caves in Vietnam [22 Pics]

Hang Son Doong is the world's biggest caves in Vietnam.

Has been explored in 2009 by a group of scientists from the British Cave Research Association.

Son Doong dimensions is more than 5km long, 200m high and 150m wide. 

Photo credit: John Spies/Barcroft Media

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Posted in: Caves, Nature, Photography, Vietnam