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