The Bosna (Cyrillic: Босна) is the thir longest river in Bosnia and Herzegovina, and is considered one of the country's three major internal rivers, along with the Neretva and Vrbas Rivers; the other three major rivers of Bosnia and Herzegovina are the Una River, to the northwest, the Sava River, to the north, and the Drina River, to the east. The Bosna River flows for 271 kilometers (168 miles). Its name does not have any foreign variations. In the Roman times the river was called the Bosona, and it is thought that this is probably the Illyrian origin of the name Bosna.