The Rudzianka stream carves a canyon in the northern slopes of the hills of Beech Forest (Polish: Puszcza Bukowa). On the section where a nameless stream flows into the Rudzianka (perhaps it is the Moszczenica?) and the black trail joins with the green one, where the Moszczenica Trail reaches the Dolinna Trail, the valley widens and is known as the Czwójdziński Gate (Polish: Brama Czwójdzińskiego), an entrance into the Bukowa Forest.