Republika Srpska (Serbian Cyrillic: Република Српска, lit. 'Serb Republic', also known as Republic of Srpska, pronounced [repǔblika sr̩̂pskaː]) is one of the two entities of Bosnia and Herzegovina, the other being the Federation of Bosnia and Herzegovina. It is located in the north and east of the country. Its largest city and administrative centre is Banja Luka, lying on the Vrbas river.