Buna

It is 9 km long and has two tributaries: Posrt, which is a non-permanent tributary, i.e. it exists only in winter, and Bunica, which is a permanent tributary and flows into Buna north of the town of Buna. It is very rich in water: with a flow of 43 m³/s, its spring is one of the strongest in Europe.

The highest water levels are in November, and the lowest in July and August. Immediately below the spring in Blagaj there is a trout hatchery and farm. It is rich in soft-lipped trout, and there are also eels in the lower reaches