Between the mountain ridge of the mountain Zelengora at an altitude of 1570 meters springs Hrcavka River. This river belongs to Foca, actually to NP Sutjeska and with its flows through the confluence of the Sutjeska River at an altitude of 530 meters.
Hrčavka is the largest tributary of Sutjeska and the altitude difference from the source to the confluence in the Sutjeska is about 1000 meters.
Hrcavka Canyon is one of the last discovered canyons in Europe and by its very nature is wild and intact. The passage through the canyon is traced with two times the length of about 13 km and the passage through the canyon can take between 4 h-6 h.
Hrcavka Canyon is covered with rocks on both sides up to 200 meters high. If you want to swim be ready for a old but clean water.
The canyon itself is quite demanding and it is necessary to use the alpinistic equipment as well to swim and jump from rocks.