Hang Son Doong cave of the mountain or river is an open cave in Phong Nha - Bang National Park , in Laos Vietnam . Recorded in 2009 as the world's largest cave . Can be seen inside a small forest with relying on sunlight that is able to enter into the cave. Inside there is a subterranean river flows fast enough. Not easy to go here at least just 500 permits issued in the past year.
Image captured by sosari29
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