Chomutov is a large town in the Czech Republic, in the Ústí nad Labem Region. It has been a statutory town since 1 July 2006. It occupies an area of 29,26 km² and has 50 782 inhabitants (2008), thereby making it the 20th largest town in the Czech Republic, the 4th largest in the Ústí nad Labem region and the biggest in the Chomutov district.
The town with the historical heart on the left side of the river Chomutovka shore in altitude of 234m is extended in Chomutovsko-Teplice basin by the foot of the Ore Mountains. The surface is mostly flat only the parts in the north and southeast protrude to the hillside about several tens meters.