- Bulgaria, Republic of Bulgaria - a republic in the eastern part of the Balkan Peninsula in southeastern Europe
--1 is a kind of Balkan country, Balkan nation, Balkan state
--1 is a part of Europe
--1 is a member of North Atlantic Treaty Organization, NATO
--1 has parts:
--1 has members: BulgarianSofia, Serdica, Bulgarian capital; Plovdiv, Philippopolis; Danube, Danube River