The Nevidio Canyon is a part of the Mala Komarnica river, which springs at the foot of the southern part of Durmitor, more precisely in Dobra Dol. It plunges between the Boljske grede (2091 m a.s.l.) and Lojanika (2091 m a.s.l.) to reappear in a tame river valley as a permanent river.
At the very end of the valley at the altitude of 935 m, the Nevidio Canyon emerges. The actual length of the canyon is 1700 m. The altitude difference is 125m (935 m a.s.l. at the entrance and 810 m a.s.l. at the outlet. In some places the width is only 25cm.