Planina Cave
Lower Sava
Planina Cave, also known locally as Planinska jama and formerly as Little Castle Cave, is one of the longest active caves in Slovenia, stretching over 6.6 kilometers. Situated in Inner Carniola, it forms a massive underground tunnel that serves as the subterranean bed of the Unica River. Notably, about 500 meters inside the cave is one of Europe's largest confluences of underground rivers, where the Pivka River and Rak River meet. The Pivka flows from Postojna Polje through the famous Postojna Cave, while the Rak travels through Weaver Cave from Rak Škocjan. The cave's entrance lies in the southwestern part of Planina Polje, beneath towering 65-meter high rocks. Hydrological studies using water tracing have confirmed a connection between Planina Cave and Postojna Cave systems, with an anticipated combined length exceeding 31 kilometers, making it a significant karst phenomenon. The cave's unique geological and hydrological features attract speleologists and nature enthusiasts alike, offering insight into subterranean river dynamics and karst topography.
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Tip: Visitors interested in exploring Planina Cave should consider guided tours arranged by local speleological groups, as the cave is an active river system and can be challenging to navigate independently. The best time to visit is during the warmer months when water levels are lower, improving accessibility and safety. Booking tours in advance is recommended, and visitors should prepare for cool, damp conditions inside the cave. Proper footwear and clothing are essential. Discounts may be available for groups or educational visits.
Interesting facts
- •Planina Cave hosts one of the largest underground river confluences in Europe, where the Pivka and Rak rivers meet.
- •The cave stretches over 6,656 meters, making it one of Slovenia's longest active caves.
- •Water tracing techniques have proven a hydrological connection between Planina Cave and Postojna Cave, potentially creating a combined system over 31 kilometers long.
History
Planina Cave has long been recognized for its extensive underground river system and karst formations.
Historically known as Little Castle Cave due to its proximity to a nearby castle, the cave's exploration expanded significantly with advancements in speleology.
Over time, hydrological research revealed its connection to the Postojna Cave system, highlighting its importance within the regional karst network.
The cave's exploration has contributed to understanding subterranean river confluences in Europe and the broader geological processes shaping the Inner Carniola region.
