Located in southwest part of Slovenia, in the Kras region, Škocjan Caves are among the most famous karstic phenomena in the world. The cave was created by the river Reka, which flows into a narrow, picturesque, 2-kilometer long gorge before entering into the underground canyon.
The Škocjan Cave system comprises collapsed dolines, about 6 km of underground passages with a total depth of more than 200 m, subterranean waterfalls, lakes, gorges and underground chambers. The largest chamber is the 123 m wide and 300 m long Martel's chamber. Škocjan Caves were included in UNESCO World Heritage List in 1986.