Near the village Koseč in the Drežnica region, there is a stream Brsnik, which carved out troughs that reach up to 60 meters in depth. The water in the troughs falls over as samll waterfalls and flows up in rapids. The troughs of Koseč are harder to access, so we cant´t see all of them. But the part of troughs, which is tidy for visiting, takes as along waterfalls of stream Stopnik all the way to the mentioned troughs of Koseč. It present itself in the beauty of the high walls, wrinkled layers of rocks, and wild nature which certainly do not leave us indifferent.