The Grønli cave is the only cave in the Nordic region which is illuminated. This has made it one of the most popular and most visited limestone caves over the last hundred years. The cave is a network of passages, fabulous shapes and forms that water and ice have sculptured through 700.000 years.
The Grønli cave is one of the biggest of the 200 caves in the district of Rana. It is 4200 metres and is located by the farm named Grønlia, situated 20 km from the city of Mo i Rana.