Zvornik (, ) is a city in Bosnia and Herzegovina. It is located in Republika Srpska, on the left bank of the Drina river. In 2013, it had a population of 58,856 inhabitants. The town of Mali Zvornik ("Little Zvornik") lies directly across the river in Serbia. Kula Grad, a village that is part of Zvornik municipality, has a Middle Age fort, Zvornik fortress, built in the 12th century. History Zvornik is first mentioned in 1410, although it was known as Zvonik ("bell tower") at that time. The town's geographic location has made it an important trade link between Bosnia and the east. For instance, the main road connecting Sarajevo and Belgrade runs through the city. The medieval fort known as Kula grad was built in the early 7th century and still stands on the Mlađevac mountainous range overlooking the Drina Valley. Ottoman rule During the Ottoman period, Zvornik was the capital of the Sanjak of Zvornik (an administrative region) within the Eyalet of Bosnia. This was primarily the case because of the city's crucial role in the economy and the strategic importance of the city's location. The Sanjak of Zvornik was one of six Ottoman sanjaks with most developed shipbuilding (besides the sanjaks of Vidin, Nicopolis, Požega, Smederevo and Mohač). In 1806, Zvornik was home to Mehmed-beg Kulenović. World War II Ustasha troops of the fascist Independent State of Croatia occupied Zvornik, along with most of Bosnia, in April 1941. The town was liberated in July 1943 by the 1st Proletarian Brigade during the Battle of Zvornik. Bosnian war During the Bosnian War (1992–1995) Zvornik's Bosniak population was expelled. The military attack of paramilitary groups that came from Serbia on Zvornik Bosniaks commenced on 8 April 1992. During April 1992, many European news stations daily reported Serb armed attacks and mass killings of the Bosniak population of Zvornik and the surrounding villages. On 19 May 1992, combined JNA, Serb paramilitary and Arkan's Tigers took control of Zvornik and Mali Zvornik. The suburbs of Karakaj and Čelopek were places of prisons where hundreds of local Bosniaks were killed. The remaining Bosniaks and non-Serbs were relegated to concentration camps and detention facilities throughout the area. During the war Serb forces destroyed mosques in and around the city. Settlements Aside from the city proper area of Zvornik, the municipality comprises the following settlements: Androvići Baljkovica Baljkovica Donja Boškovići Buložani Čelopek Cer Divič