The Bosut (Serbian Cyrillic: Босут) is a river in the Syrmia region of eastern Croatia and northwestern Serbia. It is a 186 km long, slow and meandering left tributary of the Sava river.
The riverbed begins near the left embankment of the Sava river between Županja and Štitar (45°05′46″N 18°40′36″E / 45.09611°N 18.67667°E), which in the past was an outflow channel, and a connection with the Sava. Some 2,400 m (1.5 mi) farther, the Bosut gets its first water from the Berava river (45°06′59″N 18°40′45″E / 45.11639°N 18.67917°E). The narrow riverbed widens in Cerna, where it receives the water of the Biđ.
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