Where is the world's largest known cave passage located?
in Mexico
in Norway
in Georgia
in Vietnam
Hang Sơn Đoòng is a solutional cave in Phong Nha-Kẻ Bàng National Park, Vietnam near the Laos-Vietnam border. Its total length is approx. 9 km and its main passage is the largest known in the world, being more than 5 km long, 200 m high and 150 m wide. It was discovered in 1991 and the first tourist group explored the cave in 2013.
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