The Tara (Serbian Cyrillic: Тара) is a river in Montenegro and Bosnia and Herzegovina. It emerges from the confluence of the Opasnica and Veruša Rivers in the Komovi mountain, part of Dinaric Alps of Montenegro. The total length is 144 km, of which 104 km are in Montenegro, while the final 40 km are in Bosnia and Herzegovina; it also forms the border between the two countries in several places. The Tara flows from south to north - north-west and converges with the Piva at the Bosnia and Herzegovina and Montenegro border between the villages of Šćepan Polje (Montenegro) and Hum (Bosnia and Herzegovina) to form the Drina river (a branch of the Danube watershed).
The Tara River cuts the Tara River Gorge, the longest canyon in Montenegro and Europe and second longest in the world after Grand Canyon, at 78 kilometers in length and 1,300 meters at its deepest. The canyon is protected as a UNESCO World Heritage Site, and is a part of Durmitor National Park.