As a par of the project of development of speleological sites cadastre for the municipalities of Berane, Bijelo Polje, Kolasin, Mojkovac and Petnjica, supported by the Regional Development Agency for Bjelasica, Komovi and Prokletije, 328 caves were located. The researched area contains the description of the total of 45 kilometres of underground tunnels, and the total length of all researched caves is 7725 meters. In the municipality of Berane, 90 speleological objects were described, on the territory of the municipality of Petnjica 24, 64 on the territory of the municipality of Kolasin, 36 on the territory of the municipality of Mojkovac and 114 on the territory of the municipality of Bijelo Polje.
The researched area is home to the deepest pit cave in Montenegro-Zeljezna jama (Iron deep) -1162 m. The pit cave on Tresteni Vrh (Nyx) is the cave with the deepest vertical -429 m, at the same time twelfth deepest vertical in the world. These terrifying abysses, craters that seize the soul and mind of a speleologist are situated on Maganik, municipality of Kolasin.
The longest cave in Montenegro – Pecina nad Vrazjim firovima (The Cave on Devil’s Pools) 17,5 km, is situated in the municipality of Bijelo Polje, and the researched region has eight caves longer than a kilometre. Three of those caves longer than 1000m are in the municipality of Bijelo Polje, one in Mojkovac area, and three in the municipality of Kolasin.