Burgas Varna Province Dobrich Region Blagoevgrad Mountains in Bulgaria Sliven Pernik Plovdiv Yambol Smolyan Montana Province Targoviste Silistra Veliko Tarnovo Gabrovo Ruza Sofia region Pazardzhik Lovech Shoumen region Haskovo Province Razgrad Stara Zagora Sofia-grad Pleven Kyustendilskaya Region Kardjali Vidin Vraca