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  2. Hang Sơn Đoòng - Wikipedia

    en.wikipedia.org/wiki/Hang_Sơn_Đoòng

    Formed in Carboniferous/Permian limestone, the main Sơn Đoòng cave passage is the largest known cave passage in the world by volume – 3.84 × 10 7 m 3 (1.36 × 10 9 cu ft), according to BCRA expedition leader Howard Limbert. It is more than 5 kilometres (3.1 mi) long, 200 metres (660 ft) high and 150 metres (490 ft) wide.

  3. List of longest cave by country - Wikipedia

    en.wikipedia.org/wiki/List_of_longest_cave_by...

    Vietnam Hang Khe Ry cave system 18.900 km ... North America Canada Castleguard cave: 21.311 km (13.2 mi) [110] [111 none North America Costa Rica ...

  4. Hồ Khanh - Wikipedia

    en.wikipedia.org/wiki/Hồ_Khanh

    Since the discovery, Khanh has been a guide for the team for many expeditions to explore caves in the area. He is recognised for his efforts to help his former companions to give up illegal logging to turn into sustainable tourism business. He is now a cave guide, conservationist and is running his own tour and catering business, Ho Khanh ...

  5. 18 of Earth's most otherworldly and unique caves - AOL

    www.aol.com/lifestyle/2017-07-12-18-of-earths...

    Three years later, a group of explorers were finally able to propel 80 meters down into the Hang Don Doong cave in Vietnam, a hidden space so big that it could fit a Manhattan city block complete ...

  6. Phong Nha – Kẻ Bàng National Park - Wikipedia

    en.wikipedia.org/wiki/Phong_Nha_–_Kẻ_Bàng...

    This cave has the potential to be the second biggest cave in the world, following the first biggest cave also located in a Phong Nha. In 2017, the first tourists explored the cave, guided by the man who found it. One of over 300 caves in Phong Nha Ke Bang National Park, this cave is probably the least-explored of the many caves open to tourists.

  7. List of caves in Vietnam - Wikipedia

    en.wikipedia.org/wiki/List_of_caves_in_Vietnam

    Phong Nha Cave: Unknown 7,729 m (25,358 ft) karst UNESCO World Heritage site; Quang Binh province Sơn Đoòng cave: 150 m (490 ft) 9,000 m (30,000 ft) karst Reputed to be the largest in the world; Quảng Bình Province Tam Cốc-Bích Động: Unknown 125 m (410 ft) karst Complex of three caves; Ninh Binh province Thiên Đường Cave: Unknown

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