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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reach: rather globalAsiacavesgeographytourist attractionsVietnam

Answers by country

in Mexico
in Norway
in Georgia
in Vietnam
answers
flagPakistan
8%
8%
8%
75%
12
flagRepublic of Ireland
8%
0%
25%
66%
12
flagGreece
50%
0%
14%
35%
14
flagItaly
19%
4%
42%
33%
21
flagIndia
22%
16%
22%
33%
18
flagPoland
32%
9%
29%
29%
1651
flagthe United States
33%
9%
26%
29%
71
flagGermany
37%
9%
28%
25%
75
flagAustria
37%
12%
25%
25%
16
flagAustralia
17%
11%
47%
23%
17
flagthe United Kingdom
33%
8%
36%
22%
36