Son Doong cave is the largest in the world, which is located in the National Park Phong Nha-Ke Bang Bo Trach district, Quang Binh province, Viet Nam. Near the border with Viet Nam, Laos, the international. The largest Hall within this longer cave is 4000 meters of Dong son is wider than 200 meters and 150 meters, higher than expected, this cave has 2-5 million years ago.
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