Brčko is a town in northern Bosnia and Herzegovina, administrative seat of the Brčko District. It lies on the country's border along the Sava river across from Gunja, Croatia. Its name is very likely linked to the Breuci, an Illyrian tribe inhabiting the area in antiquity (see it:Breuci). Brčko is the seat of the Brčko District, an independent unit of local self-government created on the territory of Republika Srpska and Federation of Bosnia and Herzegovina following an arbitration process; the process is viewed by some as a violation of the Dayton Peace Accords because it created the district while it could only arbitrate the disputed portion of the Inter-Entity Boundary Line, also known as the Zone of Separation (ZOS). The local administration is aided by an international supervisory regime headed by Raffi Gregorian of the United States of America.
Brčko was a geographic point of contention in 1996 when the U.S.-led Implementation Forces (IFOR) built Camp McGovern on the outskirts of the city. Camp McGovern was built in the ZOS for the purpose of establishing peacekeeping operations, specifically between Muslims in Gornji Rahić near Brka and Serbs in Brčko.