Son Doong cave
Jul 22, 2016
Discovered in 2009. Son Doong cave is world's bigges & largest& cave in Quang Binh province, Vietnam. It was created about 3 - 5 million years ago by river water eroding away the limestone underneath the mountain. Son Doong cave is about 9 kilometers long, 150 meters high and 200 meters wide.
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