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