Stara Zagora, formerly known as the Stara Zagora okrug, is a province of south-central Bulgaria. It is named after its administrative and industrial centre—the city of Stara Zagora—the sixth-biggest town in the country. The province embraces a territory of 5,151.1 km2 that is divided into 11 municipalities with a total population, as of December 2009, of 350,925 inhabitants. In the southeastern part of the province on the edge of Radnevo Municipality there is a coal production facility.