Škocjan Caves

Škocjan Caves is a UNESCO World Heritage Site and one of the most significant underground canyons in Europe, a vast system of underground chambers and passages carved by the Reka River, which disappears into the caves at Škocjan and flows underground for approximately 34 kilometres before emerging near the Timavo springs in Italy. The underground canyon at Škocjan is about 2.5 kilometres in length, and the canyon walls reach heights of over 140 metres, making this one of the largest known underground canyons in the world. The cave system is remarkable not only for its size but for the fact that the Reka River still flows through it, an active river continuing to shape the landscape that created it over geological time.

The cave system was formed by karstification, a process by which slightly acidic water dissolves limestone over thousands of years, and the scale of the passages at Škocjan reflects the enormous volume of water that has passed through the system over geological time. The Reka River enters the cave system at the surface near Škocjan village and drops through a series of rapids and waterfalls before flowing through the underground canyon and eventually emerging in Italy. Archaeological evidence shows that the caves have been known and used by humans for at least 10,000 years, and the cave entrance was inhabited in Roman times and medieval period. The natural amphitheatre above the cave entrance, known as Velika Dolina, is a large depression surrounded by vertical limestone cliffs and is home to a number of plant species that are isolated from the surrounding landscape and represent relict Mediterranean flora from the Tertiary period.

Škocjan Caves was inscribed on the UNESCO World Heritage List in 1999 on the basis of its outstanding universal value as one of the largest known underground canyons in the world and as an example of karst landscape formation. The cave system is part of a larger regional karst landscape that includes the Postojna Cave system, and the two sites together illustrate the full range of karst phenomena in the region. The cave is open to visitors, who walk through the first part of the system on a paved path and then cross the canyon on a bridge that hangs above the Reka River, with views up and down the canyon that give a sense of the sheer scale of the underground space. The experience of standing on that bridge above the river in the canyon is one of the most memorable in European cave tourism, a moment of genuine confrontation with geological time and the power of water.

One of the largest known underground canyons in the world, with walls over 140 metres high, carved by an active river.

UNESCO World Heritage status since 1999 on the basis of outstanding universal geological value.

The bridge across the Reka River canyon inside the cave gives one of the most dramatic spatial experiences in European cave tourism.