3. Postojna cave
• Longest cave in Slovenia
• 24,340 m long
• Created by the river Pivka
• 115 m deep
• Karst cave
4. Animals in Postojna Cave
• „Human fish“ or proteus
• Discovered in 1797
• In 2016 first human fish reproduction in captivity
• Home to other endemic species
• Vivarium next to the cave