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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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Rbrechko wikipedia → Optymistychna Cave

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