Kolubara

The Kolubara (Колубара, kɔlǔbara) is a long river in western Serbia; it is an eastern, right tributary to the Sava river. Kolubara is formed by the two small rivers Obnica and Jablanica. Obnica is the river in Western Serbia that springs at the foot of the mountain Medvednik. It flows eastward, through the villages of Suvodanje, Bobova, Majinović, Pričević and Zlatarić, and at the city of Valjevo meets the river Jablanica and forms Kolubara. The Obnica is 25 km long. Jablanica originates on the eastern slopes of the Jablanik mountain, just few kilometers away from Obnica. It curves around Parač mountain and next to the village of Balinović, before it meets Obnica in Valjevo. Jablanica is 21.5 km long. This is also the beginning of the 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 Ribnica 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).