Usora (Serbian Cyrillic: Усора) is a river in central-northern Bosnia and Herzegovina. It begins at the confluence of two smaller Usora rivers, Mala Usora and Velika Usora, at the town of Teslić. Usora runs for some 20 km northeast of Teslić, and becomes a left tributary of the Bosna River, south of Doboj. Its total length (including Velika Usora) is 77.0 km (47.8 mi).

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