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