Una River

The Una is a right tributary of the Sava and a border river between Bosnia & Herzegovina and Croatia. It is part of the Black Sea drainage basin, with a watershed area of 10.200 km2, 8.080 km2 of which belongs to Bosnia and Herzegovina and 2.120 km2 to Croatia. Una river is the seventh-longest river in Croatia with an overall length is 212 kilometers. The river's headwaters are in the Croatian town of Donja Suvaja, and its mouth is near the Bosnian border town of Jasenovac.

The Krka, Unac, Krunica, and Sana rivers are the major right tributaries, whereas the Klokot river is the largest left tributary. The Unac river is its longest headwater. Biha is the river's most populous and important city. Other significant cities and towns include Bosanska Krupa, Bosanski Novi, and Bosanska Kostajnica. The Una River is distinguished by a plethora of waterfalls, rapids, karst springs, and a relatively unspoiled landscape. The Una National Park encompasses a substantial portion of the upper river.

Length: 132 miles