The nature of Koli offers you great experiences. Koli rests on bedrock which is 3,000 million years old. The surface rocks in many places are 1,000 million years younger, and movement between these two strata has led to the formation of interesting valleys and caves.
If you want to go underground, contact Koli Active Oy for a cave adventure! The 127 meters long cave complex Repouuro is located close to the view point Pirunkirkko. Clothing: worn clothing that might get dirty or ripped. Recommended minimum age about 11 years.