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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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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
flagthe United States
33%
9%
26%
30%
72
flagPoland
32%
9%
29%
29%
1652
flagGermany
36%
9%
28%
25%
77
flagAustria
37%
12%
25%
25%
16
flagAustralia
17%
11%
47%
23%
17
flagthe United Kingdom
33%
8%
36%
22%
36

What is the most common surname in Vietnam?

Nguyen
Tran
Le
Pham

Which number is considered unlucky in East Asia?

3
4
12
40

What was the previous name of Ho Chi Minh city?

Hanoi
Saigon
Hai Phong
Da Nang

Where are the three tallest European waterfalls located?

in Austria
in Switzerland
in Norway
in France