About Skocjan Caves: The Skocjan Caves hold one of the world's largest underground canyons. The Reka River thunders through a huge hall about 100 m tall. It is a UNESCO World Heritage site crossed by a dizzying footbridge. The river vanishes underground and flows for kilometres

Location: In the Karst region of southwestern Slovenia · Country: Slovenia · Record: Home to one of the largest underground canyons in the world · Type: A cave carved by the roaring Reka River · Nature: A vast hall with a river thundering far below · Notable Feature: A UNESCO World Heritage site, crossed by a high footbridge · Big Number: Its main chamber is around 100 m tall · World Rank: One of the most important cave systems in Europe