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