Mediterranean and Karst Slovenia

Magical subterranean world

Kraško-mediteranska Slovenija

    Postojna Cave

    Over millions of years small water droplets shaped magnificent cave formations in the Karst and created one of the most beautiful caves in the world.



    Postojna Cave


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    If you decide to visit one of the most famous subterranean caves in the world, Postojna Cave, your path will take you to Postojna. Postojna is located just over 40 minutes by car west from Ljubljana and is a natural transition area between the Mediterranean and the eastern part of the Alps. Here, you can feel the strong northeastern wind called the ‘Burja’, which is typical for Mediterranean & Karst Slovenia. The Burja wind is known for gusts that clean out the atmosphere and chase away clouds.


    The main star of the area is, of course, Postojna Cave. This world-renowned subterranean beauty is the largest karst cave in Slovenia with no fewer than 20 km of underground tunnels. Just over five kilometres of tunnels have been arranged for tours of Postojna Cave. You can go into the cave on a small train and then continue on foot accompanied by a guide. The cave formations and the underground halls are truly incredible!

    Welcome to the Postojna Cave Park!

    This magical piece of the karst world, hidden between the Alps and the Adriatic Sea, will impress anyone who enters. Visitors stop here, look around in surprise, and then curiously explore the area down to its last corner.

    The underground world is so diverse due to the permeable limestone ground typical for the karst world. This limestone was formed by water over millions of years and created the typical surface and underground phenomena. However, Postojna Cave is not only known for its beauty. This is also home to the ‘human fish’ (proteus), an endemic species, which adapted to the unique cave environment without light and long periods without food. It was first discovered in 1797 in Črna Cave, one of the entrances to Postojna Cave.


    The cave has a rich geological and tourist history. It was of key importance in the birth of karstology and speleobiology, and there are important archaeological sites in the cave and its immediate vicinity, too. Find more about this by visiting the EXPO Postojna Cave Karst exhibition, which is on display in the immediate vicinity of Postojna Cave.


    Just a few kilometres from Postojna Cave, the 800-year-old Predjama Castle is carved into a 123-metre vertical rock face. Behind this castle, which is the largest cave castle in the world, there’s a network of tunnels, from which Erazem Predjamski set off on his plunders in the Middle Ages.


    An impressive four-storey cave is also hidden under Predjama Castle. You can see a part of this cave as part of the castle tour, while a different part of this cave can be seen as part of adventure tours.


    Active experiences in Postojna Cave and its surrounding area

    A tour of Postojna Cave is suitable for everyone. Access is also arranged for families with children and people with disabilities. Of course, speleology has been developed here for a long time. If you’d like to experience Postojna Cave like a real speleologist and go through more difficult corridors, you can go on tours with experienced guides. Adventures are intended for small groups, so pick one that is suitable to your level of experience and physical fitness.


    In addition to Postojna Cave and Predjama Castle, the forested Hrušica plateau, the Planinsko Polje field, and the Javornik Hill are also interesting. The surrounding area is also ideal for exploration on foot or by bicycle.