Kolubara

Kolubara (Колубара)
Country	Serbia
Basin features
Main source	Confluence of Obnica and Jablanica in Valjevo
River mouth	into Sava River near Obrenovac
Physical characteristics
Length	123 km (76 mi)

The Kolubara (Serbian Cyrillic: Колубара, pronounced [kɔlǔbara]), is a 123 km-long river in western Serbia; it is an eastern tributary to the Sava river.

Kolubara originates as Obnica in the Podgorina region of Western Serbia, on Povlen mountain under Medvednik peak. It flows to the North, next to the village of Bobova, bends to the West (in this part the river is also known as Jadar), and at the city of Valjevo meets the river Jablanica from the South and forms Kolubara, as the river is known for the remaining course. The Obnica is 25 km long.

Jablanica also originates from the Povlen mountain, just few kilometers away from Obnica, under Jablanik peak. It curves around Parač mountain and next to the village of Balinović, before it meets Obnica in Valjevo. Jablanica is 24 km long.

This is also the beginning of the 90 km long region of the Kolubara valley, divided in two large parts, referred to as Upper (gornja) Kolubara and Lower (donja) Kolubara (around the Belgrade's suburb of Obrenovac).

At Valjevo, the Kolubara receives the river Gradac from the right and forms the Valjevo valley between the surrounding mountains, in which it spills in several parallel flows. After Valjevo, the most populous city in western Serbia, there are no major settlements on the river, except for the villages of Mlađevo and Slovac and the river receives the right tributaries of Ribnjača and Lepenica and the left tributary of Rabas . At Slovac, near the confluence of the right tributary of the Toplica, the Kolubara carved the epigenetic Slovačka sutjeska, which separates Upper and Lower Kolubara. Upper Kolubara constitutes most of the modern Kolubara District of Serbia.

The Kolubara turns north and continues to flow in several parallel flows, receiving in this section its major tributaries: Ljig River, Turija, Lukavica and Peštan, from the right; Kladnica and Tamnava, from the left. Due to the floods, even though its valley is densely populated, there are no settlements on the river itself, until it reaches Obrenovac, few kilometers before it empties into the Sava (only navigable near its mouth in Sava). However, many large villages and towns are located in the vicinity of the Kolubara: Lajkovac, Jabučje, Lazarevac, Šopić, Skobalj, Vreoci, Mali Borak, Veliki Crljeni, Draževac, Mislođin and Barič, where it flows into the Sava.

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