Optymistychna Cave

Optymistychna Cave

Coordinates: 48°44′33″N 25°59′37″E / 48.7425°N 25.99361°E / 48.7425; 25.99361

Optymistychna (Ukrainian: Оптимістична; meaning "optimistic") is a gypsum cave located near the Ukrainian village of Korolivka, Borschiv Raion, Ternopil Oblast. As of 2005, it has 230 km of mapped passageways and is the largest cave complex in Eurasia. By some other sources it is referred as having about 133 miles (214 kilometers) of surveyed passageways, that makes it the third-longest cave in the world, after Mammoth Cave and Jewel Cave and the longest gypsum cave in the world.

The entire cave lies under a 2 kilometer square area in a layer of Upper Tertiary gypsum that is less than 20 meters thick. The passages tend to be low and often choked with mud. They comprise a dense network on several levels, making Optymistychna what is known as a "maze cave."

The cave complex was discovered by the speleologists of the Lviv speleological club "Cyclope" in 1966 who already over 40 years study the complex. There have been more than 50 expeditions since then, but exploration has slowed significantly in recent years, and very little surveying is currently being done. The cave is located very close to Ozernaya, the eleventh-longest cave in the world at 75 miles (122 kilometers), but the two caves have not yet been found to be connected.

In 2008 the cave won the special nomination as the Natural Wonder of Ukraine.

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