Where is the longest cave in Europe located?

in France
in Switzerland
in Ukraine
in Slovenia
Optymistychna Cave (Ukrainian meaning "optimistic") is a gypsum cave located near the Ukrainian village of Korolivka. Approximately 230 km of passageways have been mapped within. As a result, it is the longest cave in Eurasia, the fifth-longest cave in the world and the longest gypsum cave in the world.
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Very interesting!
reach: rather globalcavesgeographygeologyUkraine

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in France
in Switzerland
in Ukraine
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flagRepublic of Ireland
10%
0%
80%
10%
10
flagAustralia
15%
10%
55%
20%
20
flagItaly
0%
9%
54%
36%
22
flagGreece
16%
4%
40%
40%
25
flagPoland
13%
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31%
34%
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flagthe United States
33%
25%
28%
10%
66
flagGermany
23%
15%
23%
34%
69
flagthe United Kingdom
29%
9%
19%
41%
31
flagIndia
20%
37%
8%
29%
24