Valjevo is a city and the administrative center of the Kolubara District in western Serbia. According to the 2011 census, the administrative area of Valjevo had 90,312 inhabitants, 59,073 of whom were urban dwellers.
Valjevo occupies an area of 905 square kilometers; its altitude is 185 meters. The city is situated along the river Kolubara, a tributary of the Sava river.