|Main source||Vlašić mountain, northeast of Osečina, Serbia|
Tamnava river, near Šarbane, Serbia|
|Length||57 km (35 mi)|
|Progression||Tamnava→ Kolubara→ Sava→ Danube→ Black Sea|
|Basin size||274 km2 (106 sq mi)|
The Ub originates from the Vlašić mountain in Podgorina region of west Serbia, near the village of Kasapo. From its source to the mouth, the river flows to the east, parallel to the river Tamnava, which it will eventually join.
The villages located in the upper section of the river's flow are Družetić, Pambukovica and Čučuge, where the Ub slightly turns to the north, passes through the villages of Tvrdojevac and Zvizdar, and the small town of Ub, named after the river.
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