The Olza River is formed by combining several small mountain streams, flowing mostly on the western slopes of Gańczorka (909 m), Tyniok (891) and Koczy Castle (846). The symbolic source of the Olza is considered one of the outflows, located at Gańczorka. One of the biking trails marked in the vicinity of Istebna leads to this place, although the last part of the route is more suitable for a pedestrian crossing.