Optymistychna Cave
The 30th deepest cave in the world
The 3rd longest cave in the world
20m · Depth
264.6km · Length
Optymistychna Cave (lit. 'optimistic') formerly known as Peshchera Optimistitscheskaya, is a gypsum cave located near the Ukrainian village of Korolivka, Chortkiv Raion, Ternopil Oblast. Approximately 264 km (164 mi) of passageways have been mapped within. As a result, it is the longest cave in Europe and the seventh-longest cave in the world. It is also the longest gypsum cave in the world.
Cave data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).