Ide o turisticky atraktívnu, krasovú kaňonovitú dolinu potoka Proiečanka v Chočských vrchoch, tvorenú vápencami a dolomitmi.Vstup do doliny tvorí impozantná kamenná brána.
It is a tourist-attractive, karst canyon-like valley of the Proiečanka stream in the Choč Mountains, formed by limestones and dolomites. The entrance to the valley is formed by an impressive stone gate.