 Bulgaria ( / bʌlˈɡɛəriə , bʊl- / ; Bulgarian : България , tr . Bǎlgariya ) , officially the Republic of Bulgaria ( Bulgarian : Република България , tr . Republika Bǎlgariya , pronounced [ rɛˈpublikɐ bɐɫˈɡarijɐ ] ) , is a country in southeastern Europe . It is bordered by Romania to the north , Serbia and Macedonia to the west , Greece and Turkey to the south , and the Black Sea to the east . With a territory of 110 @,@ 994 square kilometres ( 42 @,@ 855 sq mi ) , Bulgaria is Europe 's 16th @-@ largest country . 
