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
in Slovenia
answers
flagItaly
0%
0%
60%
40%
20
flagAustralia
16%
5%
55%
22%
18
flagGreece
17%
4%
43%
34%
23
flagPoland
13%
21%
31%
33%
1396
flagthe United States
32%
25%
29%
11%
62
flagGermany
22%
15%
25%
33%
63
flagthe United Kingdom
25%
10%
17%
46%
28
flagIndia
25%
35%
5%
30%
20