From the Wikipedia page 
See also Republika Srpska.
Serbia i/ˈsɜrbiə/, officially the Republic of Serbia (Serbian: Република Србија / Republika Srbija, pronounced [rɛpǔblika sř̩bija]), is a country located at the crossroads of Central and Southeast Europe, covering the southern part of the Pannonian Plain and the central Balkans. A landlocked country (78 km from the Adriatic sea), Serbia borders Hungary to the north; Romania and Bulgaria to the east; Macedonia to the south; and Croatia, Bosnia, and Montenegro to the west; also, it borders Albania through the disputed territory of Kosovo. The capital of Serbia, Belgrade, is among Europe's oldest cities, and one of the largest in East Central Europe.