# Optimisticeskaja

- **Length:** 230 km
- **Geology:** gypsum
- **Location:** near Ukrainian village of Korolivka, Chortkiv Raion, Ternopil Oblast
- **Discovery:** 1966

Optymistychna Cave formerly known as Peshchera Optimistitscheskaya, is a gypsum cave located near the Ukrainian village of Korolivka, Chortkiv Raion, Ternopil Oblast. Approximately 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.

![Photo of Optimisticeskaja](https://upload.wikimedia.org/wikipedia/commons/a/a7/Optymistychna_Cave.jpeg)

**Source:** https://en.wikipedia.org/wiki/Optimisticeskaja (Wikipedia, CC BY-SA)