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%
66%
33%
18
flagGreece
17%
5%
47%
29%
17
flagAustralia
23%
7%
46%
23%
13
flagPoland
13%
21%
29%
34%
1207
flagthe United States
31%
29%
25%
11%
51
flagGermany
25%
14%
21%
34%
55
flagthe United Kingdom
26%
11%
11%
50%
26
flagIndia
23%
41%
5%
29%
17