The city of Sliven (comparatively large town - 8th largest in Bulgaria) is located in South-East Bulgaria. It is administrative center of Sliven District. The town is situated in the eastern part of the Gornotrakiiska valley at at 270m above sea level in the immediate foot of Sliven Balkan (Eastern Balkan Mountains), 270 km east of Sofia, 28 km northwest of Yambol, 70 km northeast of Stara Zagora, 75 km east of Kazanlak and 114 km west of Bourgas.