Republika Srpska located in the administrative territorial entity Bosnia and Herzegovina
Republika Srpska (Serbian Cyrillic: Република Српска, pronounced [repǔblika sr̩̂pskaː] (listen); also known as Republic of Srpska) 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.
Republika Srpska was formed in 1992 at the outset of the Bosnian War with the stated intent to safeguard the interests of the Serbs of Bosnia and Herzegovina. The war saw the expulsion of the vast majority of Croats and Bosniaks from the territory claimed by Republika Srpska and an inflow of Serbs expelled from Federation of Bosnia and Herzegovina. Following the Dayton Agreement of 1995, Republika Srpska was recognised as an entity within Bosnia and Herzegovina. Today most of Bosnia and Herzegovina's Serb population lives in Republika Srpska. 
Republika Srpska is a parliamentary-style government, with the National Assembly holding legislative power within the entity. Republika Srpska is relatively centralised, although it is split into 64 municipalities called opštine. The legislature holds 83 seats, and the current session is the tenth since its founding.20th century
With the assassination of Archduke Franz Ferdinand of Austria, carried out by Bosnian Serb Gavrilo Princip, a member of the Yugoslavist Mlada Bosna, World War I broke out in 1914. Following the war, the territory of modern-day Republika Srpska was incorporated into the Vrbas, Drina, and Zeta banovinas of the Kingdom of Serbs, Croats, and Slovenes, renamed Yugoslavia in 1929.
Following the outbreak of World War II and the invasion of Yugoslavia in 1941, Republika Srpska fell under the rule of the Nazi puppet state, The Independent State of Croatia. Around 300,000 Serbs are estimated to have died under the Ustashe regime as a result of their genocide campaign; a slew of massacres, as well as the use of a variety of concentration and extermination camps, took place in Republika Srpska during the war. The Jasenovac concentration camp, located in modern-day Croatia, was the site of the deaths of some 100,000 people, about 52,000 of which were Serbs. Massacres also occurred at Garavice and Kruščica concentration camp in the eastern part of Bosnia. The regime systematically and brutally massacred Serbs in villages in the countryside, using a variety of tools. The scale of the violence meant that approximately every sixth Serb living in Bosnia-Herzegovina was the victim of a massacre and virtually every Serb had a family member that was killed in the war, mostly by the Ustaše. An estimated 209,000 Serbs or 16.9% of its Bosnia population were killed on the territory of Bosnia–Herzegovina during the war. Today, monuments honouring these victims can be found across Republika Srpska and Bosnia and Herzegovina.
The Yugoslav royalist Chetniks, a guerilla force that engaged in tactical or selective collaboration with the occupying forces for almost all of the war, pursued genocide against Croats and Bosniaks, which included thousands of Croat and Muslim civilians killed on the territory of modern-day Republika Srpska. The Chetniks killed an estimated 50,000 to 68,000 Muslims and Croats. About 300 villages and small towns were destroyed, along with a large number of mosques and Catholic churches.During the entire course of WWII in Yugoslavia, 64.1% of all Bosnian Partisans were Serbs.After World War II came a period of relative peace and economic development. Ljubija mine and companies like Agrokomerc played a vital role in much of the economic development of the Socialist Republic of Bosnia and Herzegovina. Literacy rates increased greatly, and the University of Banja Luka was founded in 1975.Boundary
Republika Srpska shares international borders with Croatia to the north, Serbia to the east, and Montenegro to the southeast. Within Bosnia and Herzegovina, the Inter-Entity Boundary Line (IEBL) marks Republika Srpska's administrative division with the Federation of Bosnia and Herzegovina, and essentially follows the front lines at the end of the Bosnian War with some adjustments (most importantly in the western part of the country and around Sarajevo) as defined by the Dayton Agreement. The total length of the IEBL is approximately 1,080 km. The IEBL is an administrative demarcation uncontrolled by military or police and there is free movement across it.
situated in found in positioned in