the Višegrad Reservoir, created by the Višegrad hydroelectrical power plant on the Drina. Characteristics Lim belongs to the Black Sea drainage basin through Drina, Sava and Danube. Its drainage basin covers and the river is not navigable. It receives many smaller streams in Montenegro and Bosnia and Herzegovina, however, the two most important are its major right tributaries in Serbia, the Uvac and the Mileševa river. Three hypotheses exist about the origin of its name: Latin origin derived from the word limes, meaning border; Celtic origin from the root llyn or llym, meaning water or lake. This version was supported by Miloš Crnjanski in the section Celts in our rivers of his book British-Balkan connections: Connections in prehistory; Albanian origin from the root lymë, meaning river Polimlje The fertile valley of the river is called Polimlje (Полимље), meaning "Lim valley". It represents area around composite river valley, made of several gorges and depressions. The valley is divided in three large parts, Montenegrin, Stari Vlah and Bosnian. It is important agricultural region, especially for cultivating fruits and stockbreeding. It is also an important route for both the road and railways from Serbia to Montenegro and Adriatic coast, most notably, the Belgrade-Bar railway. Industry is not much developed (smaller industrial centers are Berane, Bijelo Polje and Prijepolje), except for heavily industrialized Priboj. Most use of the river has Serbian electricity production, with power station Potpeć being constructed and several more stations on the Lim's major tributary, the Uvac. Despite the potentials, the entire area the Lim flows through is undeveloped and for decades highly depopulating. Border dispute After breakup of Yugoslavia in 1991-1992, on the part of Lim's course entering and re-entering Serbia and Bosnia, several villages of Serbia remained physically cut off from the rest of the republic's territory. The governments in Belgrade and Sarajevo proposed an exchange of territories but no agreement was reached. Lim River tragedy On 4 April 2004, around 10 PM, a bus carrying Bulgarian tourists (34 students and 16 adults) back to their native Svishtov from a trip to Dubrovnik in Croatia fell and sank in the river near the Serbian village of Gostun close to the border with Montenegro as the driver lost control over it during a turn on a mountain road. Twelve children died, the other 38 people being saved with the aid of the locals. See also List of rivers of Bosnia