Bulgaria (bŭlgâr'ēu) [key], Bulgarian Balgarija, officially Republic of Bulgaria, republic (2005 est. pop. 7,450,000), 42,823 sq mi (110,912 sq km), SE Europe, on the E Balkan Peninsula. It is bounded by the Black Sea on the east, by Romania on the north, by Serbia and Macedonia on the west, by Greece on the south, and by European Turkey on the southeast. Sofia is the capital. Other important cities are Varna and Burgas (the main Black Sea ports of Bulgaria), Plovdiv and Ruse.
