Valjevo is a city located in Serbia.  The municipality of Valjevo is situated in Western Serbia and is the center of the Kolubara District, which includes five other smaller municipalities. Valjevo was formed near the river Kolubara, a tributary of the Sava river. The area of Valjevo has a mild, temperate climate.
Valjevo mountain range (Medvednik, Jablanik, Povlen, Maljen, Suvobor) with gently-rolling hills surrounding the town is an oasis of clean air, medicinal herbs, forest fruits and wild game. The environment is kept away from industrialisation, the soil unpolluted, so the food is healthy too, and the conditions for hunting and fishing in the mountain rivers are extraordinary. The air-spa of Divčibare is ideal for rest, rehabilitation and recreation. Vrujci Spa has mud-baths for rheumatic diseases, as well as a hotel and sport complex with swimming pools.
The canyon of the river Gradac, (also a name of a suburb in Valjevo) whose course, with almost untouched nature, ends in the town centre, is a favourite picnic area of Valjevo citizens during hot summer days. The Gradac is one of the cleanest European rivers, which is evidenced by the presence of otters, which exclusively inhabit clean waters. It abounds in brook trout, so it is a haven for fly angling fans. Old water mills are one of the symbols of this natural reserve of 13 square kilometres, which has been entrusted by the Valjevo Municipal Assembly to the Gradac Ecological Society. It might become a national park in the near future.