The Tamnava is a river in western Serbia

Serbia

Serbia , officially the Republic of Serbia , is a landlocked country located at the crossroads of Central and Southeast Europe, covering the southern part of the Carpathian basin and the central part of the Balkans...

. It is 90 km long left tributary of the Kolubara River

Kolubara River

The Kolubara , is the 123 km-long river in western Serbia; it is the eastern tributary to the Sava river.- Origin :...

 and also gives the name to the surrounding region of Tamnava.

Origin

The Tamnava originates from several small streams from the hill of Konjsko brdo (Cyrillic: Коњско брдо; Horse hill) on the northern slopes of the Vlašić

Vlašić (Serbia)

Vlašić is a low mountain in western Serbia, between towns of Osečina and Koceljeva. Its highest peak has an altitude of 474 meters above sea level....

 mountain, northwest of the town of Valjevo

Valjevo

Valjevo is a city and municipality located in western Serbia. It is the center of the Kolubara District, which includes five other smaller municipalities with a total population of almost 180,000 people...

, less than a kilometer away from the source of its major tributary, the Ub River

Ub River

The Ub is a river in western Serbia, a 57 km-long right and longest tributary to Tamnava river.The Ub originates from the Vlašić mountain in Podgorina region of west Serbia, near the village of Kasapo...

. The Tamnava passes next to the village of Miličinica

Miličinica

Miličinica is a village in the municipality of Valjevo, Serbia. According to the 2002 census, the village has a population of 913 people....

, makes sharp turn to the northwest along the Vlašić mountain, passes the village of Donje Crniljevo

Donje Crniljevo

Donje Crniljevo is a village in Serbia. It is situated on the banks of the Tamnava river in the Koceljeva municipality, in the Mačva District of Central Serbia...

 and makes another sharp, elbow turn to the east around the Braznik hill (Cyrillic: Бразник) , near the Gradojević

Gradojevic

Gradojević is a village in Serbia. It is situated in the Koceljeva municipality, in the Mačva District of Central Serbia. The village had a Serb ethnic majority and a population of 250 in 2002.-Historical population:*1948: 647*1953: 640...

 village. At the village of Kamenica

Kamenica

Kamenica is a Slavic toponym that may refer to several places:* In Albania** Kamenica Tumulus, a neolithic tumulus close to Kamenicë, Korçë...

, the Tamnava makes almost complete circle (triangle, in this case) as it comes just a kilometer away from its own furthermost source. In this early flow, the Tamnava makes the southeastern border of the Pocerina

Pocerina

- See also :* Regions of Serbia...

 region of western Serbia.

Tamnava region

The Tamnava region begins as the river passes between the village of Subotica

Subotica

Subotica is a city and municipality in northern Serbia, in the Autonomous Province of Vojvodina...

 and a small town and regional center of Koceljeva

Koceljeva

Koceljeva is a village and municipality located in the Mačva District of Serbia. In 2011, the population of the village is 4,217, while population of the municipality is 13,155.-Municipality:...

. The villages of Tamnava, Novaci

Novaci (Ub)

Novaci is a village in the municipality of Ub, Kolubara District, Western Serbia. Total number of inhabitants is 879 ....

, Kalinovac

Kalinovac

Kalinovac is a municipality in the Koprivnica-Križevci County in Croatia. According to the 2001 census, there are 1,725 inhabitants in the area, with Croats forming an absolute majority....

, Trlić

Trlić

Trlić is a village in the municipality of Ub, Serbia. According to the 2002 census, the village has a population of 1020 people....

, Sovljak

Sovljak

Sovljak is a village in Serbia. It is situated in the Bogatić municipality, in the Mačva District. The village has a Serb ethnic majority and its population numbering 618 people ....

 and Crvena Jabuka

Crvena jabuka

Crvena jabuka is a Sarajevo-based pop band that originated in 1985, and since then has remained very popular. They were also a part of the so called New Primitives movement that occurred in the 1980s in the Former Yugoslavia territory....

 are located on the river which has been followed by the satellite flow of the Ub River

Ub River

The Ub is a river in western Serbia, a 57 km-long right and longest tributary to Tamnava river.The Ub originates from the Vlašić mountain in Podgorina region of west Serbia, near the village of Kasapo...

 ever from the source on the Vlašić

Vlasic

Vlasic Pickles is an American brand of pickles currently owned by Pinnacle Foods. Since its introduction in 1942, it has become one of the most popular pickle brands in the United States.-History:...

 mountain. The Ub finally meets the Tamnava near the village of Šarbane

Šarbane

Šarbane is a village in the municipality of Ub, Serbia. According to the 2002 census, the village has a population of 545 people....

. The river turns northeast and after it passes the village of Liso Polje

Liso Polje

Liso Polje is a village in the municipality of Ub, Serbia. According to the 2002 census, the village has a population of 278 people....

 flows into the Kolubara, south of the Belgrade

Belgrade

Belgrade is the capital and largest city of Serbia. It is located at the confluence of the Sava and Danube rivers, where the Pannonian Plain meets the Balkans. According to official results of Census 2011, the city has a population of 1,639,121. It is one of the 15 largest cities in Europe...

's suburb of Obrenovac

Obrenovac

Obrenovac is a town and municipality located in Serbia at 44°40′ North, 20°13′ East. Its name stems from last name "Obrenović" which in turn stems from name "Obren" in Serbian language. In 2003 the municipality has total population of 75,949...

.

The region is low, elongated in the west-east direction, encompassing also the valleys of the Ub and Kladnica rivers. It is part of the southern Pannonian plain, that is, of the ancient Bay of Kolubara of the Pannonian Sea

Pannonian Sea

The Pannonian Sea was a shallow ancient sea located in the area today known as the Pannonian Plain in Central Europe. The Pannonian Sea existed during the Miocene and Pliocene epochs, when three to four kilometres of marine sediments were deposited in the Pannonian Basin.-History:The Pannonian Sea...

. The region is rich in coal (Tamnava coal mines) which is part of the vast Kolubara coal basin.

The Tamnava drains an area of 930 km², through the Kolubara belongs to the Black Sea

Black Sea

The Black Sea is bounded by Europe, Anatolia and the Caucasus and is ultimately connected to the Atlantic Ocean via the Mediterranean and the Aegean seas and various straits. The Bosphorus strait connects it to the Sea of Marmara, and the strait of the Dardanelles connects that sea to the Aegean...

 drainage basin

Drainage basin

A drainage basin is an extent or an area of land where surface water from rain and melting snow or ice converges to a single point, usually the exit of the basin, where the waters join another waterbody, such as a river, lake, reservoir, estuary, wetland, sea, or ocean...

and it is not navigable. The name of the river, Tamnava, in Serbian means The dark river.