Valjevska Tamnava () is a historical subregion (or microregion) in Serbian Posavina in west Serbia. It includes villages in the area of Obrenovac, Lajkovac, Ub, Valjevo and Koceljeva. It was a kneà ¾ina (Christian self-governing village group) in the Sanjak of Smederevo and a kneà ¾ina (administrative unit) in Revolutionary Serbia.
Further, the Posavina (Sava basin) region includes the microregions of Posavina and Posavotamnava.
Pavlovià(1912) describes Valjevska Tamnava in the wider sense as stretching from the Kolubara river in the east, Sava river in the north, Vukodraà ¾ river in the west, and Vlaà ¡iàmountain in the south.
In the Middle Ages, during the Banate of Macsó of Hungary and the Serbian Despotate, the à ¾upa (counties) of Beljin, NepriÃÂava, Kolubara, Tamnava and Ub, were mentioned in the 14th- and 15th centuries in the area of Tamnava.
During the First Serbian Uprising (1804âÂÂ13), the Valjevska Tamnava area was organized into a kneà ¾ina (administrative unit) of Revolutionary Serbia, belonging to the Valjevo nahiya. The Valjevo nahiya had included three kneà ¾ina (Christian self-governing village groups) prior to 1804, the Posavina (or "Valjevska Tamnava"), Jadar, Ljig/Podgor (or "Valjevska Podgorina"). Prior to the uprising, Free Corps veteran Aleksa Nenadoviàfrom Brankovina served as the obor-knez of PosavinaâÂÂTamnava. He was executed by the Dahije in the Slaughter of the Knezes in January 1804.
On , Serb notables met at Oraà ¡ac in the Kragujevac nahiya and decided to rise up under the command of KaraÃÂorÃÂe. Aleksa's brother Jakov Nenadoviàhad succeeded as obor-knez of Tamnava, and when hearing that the Kragujevac, Rudnik and most of the Belgrade nahiyas had risen up, he and his nephew, Aleksa's son, the archpriest Matija NenadoviÃÂ, decided to organize rebellion in the Valjevo nahiya. On , or the following day, the Serb notables of the Valjevo nahiya gathered at the Brankovina height (BrankovaÃÂki vis) and decided to rise up against the Dahije. Some 700 men were gathered, but they were ill-equipped. Jakov took 300 men of Posavina and Tamnava and went to Beljin and fought with the à  abac Turk detachment on , with many wounded on both sides. The rebels under Matija Nenadoviàand Nikola Grboviàtook over Valjevo in March and at the same time, Jakov Nenadoviàdestroyed an enemy unit at Svileuva.
The Valjevska Tamnava rebel unit participated at Svileuva, Beljin, ÃÂuÃÂuge, BrataÃÂiÃÂ, Bukovica, Mià ¡ar, Loznica, Leà ¡nica. Among notable leaders, comrades of the Nenadoviàfamily of the Valjevo nahiya and Luka Lazareviàof the à  abac nahiya, were Isailo Laziàfrom Krtinska, Petar Eriàfrom ZveÃÂka, priest Leontije Markoviàfrom Urovci, à ½ivan Petroviàfrom KaleniÃÂ, Vasilj Pavloviàfrom Bajevac, ÃÂura Kostiàfrom Crvena Jabuka, hegumen Jeremija from Grabovica, Milovan Zujaloviàfrom Tulari, à ½ivko Dabiàfrom Gola Glava, Jovan TomiÃÂ-Belov from Donje Crniljevo, Mihailo Gluvac from Kamenica, Rade Radosavljeviàfrom GoloÃÂelo, and others.