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By mid-2019, the cave was found to be connected by its underground river with a nearby cave called Hang Thung. This increases the potential volume of the cave by more than 1,600,000 m 3 (57,000,000 cu ft). [13] The cave contains some of the tallest known stalagmites in the world, which are up to 80 m (260 ft) tall. [14]
Phong Nha Cave is a cave in Phong Nha-Kẻ Bàng National Park, a UNESCO World Heritage Site in Quảng Bình Province, Vietnam. It is 7,729 metres long and contains 14 grottoes, as well as a 13,969 metre underground river.
Before Sơn Đoòng Cave was found, Phong Nha Cave was regarded by British Caving Association as the top cave in the world due to its top four records: the longest underground river, the highest and longest cave, broadest and most beautiful fine sand beaches inside the caves, and the most spectacular stalagmites and stalactites.
The world's largest cave is so big that a Boeing 747 could fly through its largest cavern unscathed. It could fit a Manhattan city block complete with 40-story skyscrapers and has its own weather ...
Throughout South Vietnam, there were secret underground bases that operated successfully. There are reports that every villager was obliged to dig 90 cm (35 in) of tunnel a day. The largest underground base was the tunnels of Cu Chi with an overall length of 320 km (200 mi).
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
Khanh agreed to guide the team to find the legendary cave. On their first expedition, the group found 11 previously unrecorded caves, two caves were named after Khanh and his daughter, Thai Hoa. After two more fruitless expeditions, the cavers finally gave in and left, asking Khanh to contact them if he found it again.
Hang Én ('swift cave' in Vietnamese, named for the birds that nest in it [1]), occasionally referred to as Én cave in English, is a cave in Phong Nha-Ke Bang National Park, a UNESCO World Heritage Site. Én is the third largest cave in the world, after Hang Sơn Đoòng in the same national park, and Deer Cave in Malaysia.
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