Karnobat municipality is situated in the south-eastern part of Bulgaria, and it falls within the administrative boundaries of Burgas region. Rishki Passage links the municipality to north Bulgaria. The Karnobat-Aitos range of the Balkan Mountains is located
in the northern part of the municipality. Hisar Hill raise to the south of the town of Karnobat. The territory of Karnobat municipality is 806 km2 (311 sq mi).