Best lakes around Notranjski regijski park are characterized by unique hydrological features, including intermittent lakes and subterranean cave systems. This region in Slovenia is renowned for its dynamic karst landscape, where water levels fluctuate dramatically, creating diverse ecosystems. It is a significant natural wonder, showcasing impressive geological formations and supporting a rich biodiversity, including numerous bird and mammal species. The area offers opportunities for exploring natural phenomena and engaging with its distinctive environment.
Last updated: June 29, 2026
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Beautiful panoramic point for birdwatching or just to admire the lake (when there is one) in all its beauty
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When the Cerknika plain becomes a lake, this small village turns into a beautiful island connected to the rivers by two bridges. Cycling in this period gives this small village a truly incredible charm.
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Among the most beautiful passages when the lake covers the countryside. The village of Otok takes on a truly unforgettable charm. Silences that reconcile the heart
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small viewpoint on the trail crossing Cerknisko jezero. In the period when the lake rises this passage is the only one that allows crossing to the other shore
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Spectacular passage on the "island" of Otok, when the lake rises this small village takes on a unique charm
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Very relaxed gravel throughout the 'sea'
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»The Cerkniško jezero (German: Zirknitzer See) is located in the south-west of Slovenia, in the southern part of the Zirknitzer Basin, and is the largest percolating lake on earth.« via https://de.wikipedia.org/wiki/Cerkni%C5%A1ko_jezero
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The ephemeral lake of Cerknica / Circonio is a spectacle: a real lake during the rainy season, a fertile plain during the dry ones.
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The lakes in Notranjski regijski park are renowned for their unique hydrological features, particularly the intermittent nature of Lake Cerknica and the subterranean lakes found within Križna Jama cave. This region's dynamic karst landscape means water levels fluctuate dramatically, creating diverse ecosystems and impressive geological formations.
The best time to visit depends on what you want to experience. For Lake Cerknica, if you wish to see it as a full lake for activities like boating, visit after heavy rainfall, typically in spring or autumn. If you prefer hiking or cycling across its dry bed, summer or drier periods are ideal. Križna Jama cave tours are available year-round, but check their specific operating hours.
Yes, the area offers several family-friendly options. The Birdwatching Pavilion at Lake Cerknica and the Observatory - Cerknica Intermittent Lake are great for observing wildlife. Easy cycling tours, like the 23 km circular path around Lake Cerknica, are also suitable for families.
Notranjski regijski park is a biodiversity hotspot. Lake Cerknica alone is home to over 270 bird species, 50% of Europe's mammal species, 25% of its amphibian species, and 30% of its butterfly species. You might spot various birds from the Observatory, including storks, and observe rich flora like orchids and carnivorous plants.
Absolutely. When Lake Cerknica is dry, you can hike and cycle across its bed. There's also a gravel path near Otok that offers scenic views. For more structured routes, you can explore various easy hikes or moderate to difficult hiking trails in the wider Notranjski regijski park area, as well as MTB trails.
Križna Jama (Cross Cave) is a globally recognized cave system within the park, famous for its 22 emerald-green underground lakes connected by a crystal-clear stream. It's one of the world's most biologically diverse caves. Visitors can take guided tours to explore this pristine underground world, which also holds archaeological discoveries like over 2,000 cave bear bones.
Yes, the Observatory - Cerknica Intermittent Lake provides an excellent vantage point to witness the lake's dynamic nature and observe various bird species. Another good spot is the Birdwatching Pavilion at Lake Cerknica.
The 'Island' of Otok refers to the village of Otok, which takes on an island-like appearance when the Cerknica plain fills with water, transforming into Lake Cerknica. It's connected to the mainland by bridges during these times, offering a unique and charming landscape, especially for cyclists.
While not a lake itself, the Rakov Škocjan valley, directly linked to the region's hydrology, features impressive natural geological formations. You can see natural bridges, such as the 42-meter Little Natural Bridge and the 37-meter Big Natural Bridge, along with caves, springs, and sinkholes, showcasing the dramatic effects of water on limestone.
Visitors are captivated by the unique natural phenomena, especially the intermittent Lake Cerknica and its dramatic transformations. The rich biodiversity, opportunities for birdwatching, and the serene experience of cycling or hiking through ever-changing landscapes are highly appreciated. The geological significance and the sense of being in a truly dynamic natural environment are also major draws.
Yes, there are several easy hiking options. For instance, the 'Notranjska Regional Park Parking Lot – Lake Cerknica loop from Dolenje Jezero' is an easy 5.1 km hike. You can find more easy routes in the Easy hikes around Notranjski regijski park guide.
Yes, the Observatory - Cerknica Intermittent Lake offers shaded picnic tables, and the Birdwatching Pavilion at Lake Cerknica also provides facilities. For more extensive options, the nearby towns and villages around Notranjski regijski park will have cafes and restaurants.

