Crna Mlaka Bird Reserve is situated only 14 km away from the town. With its unique hydrographic and vegetation features, many bird species and oak forests, it is the place you simply must visit. During most of the year protected and rare birds inhabit the reserve: sea eagle, cormorant, black stork, grebe, heron, duck and other. Ornithologists have identified around 230 bird species, and in 1980 Crna Mlaka becomes a special protection reserve. The reserve covers the area of 6,87 square kilometres. A fishpond network used to this day was build in the late 1920s and is situated in the lowest part of the Kupa basin.
It is closed for tourist visits.