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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