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National Geographic pictorial of Hang Sơn Đoòng "American Film Crew's Backstage Inside Son Doong". Archived from the original on July 15, 2015 Saigon-online-SonDoong-cave; Strutner, Suzy (September 7, 2013). "World's Largest Cave, Son Doong, Prepping For First Public Tours" (includes video). The Huffington Post
Despite all of our recent advancements in technology, the Hang Son Doong cave in Vietnam was not even encountered until 1991, millions of years after its creation.
Hang Son Doong, which translates as ‘mountain river cave’ is the largest cave passage in the world […] Vietnam’s Eighth Wonder of the World Revealed in ‘A Crack in the Mountain’: Watch ...
Sơn Đoòng cave doline. During the 1990s, Hồ Khanh was living as a very poor man, trying to earn an honest living in Bố Trạch.During a jungle expedition to extract agarwood in 1991, Hồ Khanh reportedly discovered an enormous cave entrance, with a wide river flowing out of it.
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Most of the rivers originate in the Truong Son Range and empty into the Sea. River and stream density is 1.1 km/km 2 . There are some 160 natural and man-made lakes with total water deposit of 234.3 million cubic meter of fresh water, Quảng Bình Province's sea area includes continental shelf and special economic area up to 20,000 km 2 .
According to the assessment of UNESCO, "The karst formation of Phong Nha-Kẻ Bàng National Park has evolved since the Palaeozoic (some 400 million years ago) and so is the oldest major karst area in Asia" and "Phong Nha displays an impressive amount of evidence of earth's history. It is a site of very great importance for increasing our ...
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