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Coastal town with colorful buildings reflecting in the calm water

Explore

Guided Underground Tour (Tour 1)

This is the primary, mandatory guided route through the main cave system.

Photo: tour listing on Viator

The standard tour covers approximately 3 kilometers of trail and lasts 90 to 120 minutes. You must be accompanied by an official park guide. The path requires descending and climbing several hundred stairs across wet, uneven terrain.

The interior maintains a constant 12 °C (54 °F) temperature year-round. Photography and filming are strictly forbidden inside the caves to protect the ecosystem and keep groups moving.

Predjama Castle built into a rocky cliff face, Slovenia
Photo: tour listing on Viator
01

Silent Cave (Tiha jama)

30-40 minutesFeatures the 'Giant' stalagmite

This is a dry, fossilised section of the cave filled with stalactites, stalagmites, and flowstone. It serves as the introduction to the underground system. Look out for the 'Giant' (Orjak) in the Great Hall. It is one of the largest stalagmites in the entire cave.

Underground river and waterfall flowing through a rocky cave
Photo: tour listing on Viator
02

Murmuring Cave (Šumeča jama)

45 minutesNo photos allowed

This colossal underground canyon was carved by the active Reka River roaring below. The canyon reaches a depth of up to 146 meters. Park rules strictly ban photography in this section. Keep your camera stored away and focus on the immense rock formations.

Hikers on a trail looking at an underground river gorge
Photo: tour listing on Viator
03

Cerkvenik Bridge

5 minutes47 meters above river

This narrow, illuminated footbridge spans the canyon. It is suspended 47 meters above the underground river. The crossing can trigger vertigo for some visitors. Keep moving steadily and hold onto the sturdy handrails as you walk.

Book a Cave Tour

Underground river flowing through a massive cave with a lighted path
UNESCO's Skocjan Caves, Europe's largest underground canyon, Half Day Trip from Ljubljana4 h to 5 h 5.0 (8)from $170
half-day from ljubljanafrom $170 on Viator
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