Cluj-Napoca (Romanian pronunciation: [ˈkluʒ naˈpoka] ; German: Klausenburg; Hungarian: Kolozsvár, Hungarian pronunciation: [ˈkoloʒvaːr] ; Medieval Latin: Castrum Clus, Claudiopolis; Yiddish: קלויזנבורג, Kloiznburg), commonly known as Cluj, is the second most populous city in Romania and the seat of Cluj County in the northwestern part of the country. Geographically, it is roughly equidistant from Bucharest (324 km / 201 mi), Budapest (351 km / 218 mi) and Belgrade (322 km / 200 mi). Located in the Someşul Mic River valley, the city is considered the unofficial capital to the historical province of Transylvania. Between 1790–1848 and 1861–1867, it was the official capital of the Grand Principality of Transylvania.