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