The wild and hard to reach Koseška korita (chutes), which are up to 60 meters deep and only part of which can be seen, are located below Koseč.
 
A hiking trail leads past the little Church of Sv. Just, along the Stopnik stream, which on its way to the Ročica created a several high waterfalls, and then turns to the Koseška chutes. The Brsnik stream carved deep chutes in the limestone strata with steep and uneven gradients of the riverbed so that the water flows over waterfalls and cascades and rushes in rapids.

Karst springs in the walls of the chutes deposited tufa that was used in the construction of the Church of Sv. Just. Just before the confluence of the Brsnik and the Ročica, nature shaped a natural passage through the chutes.

The path leads back to Koseč along the left bank of the Ročica.