Bijeljina (Cyrillic: Бијељина; pronounced [bijêːʎina]) is a city and municipality in northeastern Bosnia and Herzegovina. The city is the second largest in the Republika Srpska entity after Banja Luka and fifth largest city in Bosnia and Herzegovina (after Sarajevo, Banja Luka, Tuzla and Zenica), and is situated on the plains of Semberija. Bijeljina is the unofficial center of eastern part of Republika Srpska, with 114,663 inhabitants.