Coordinates: 46°46′N 23°35′E / 46.767°N 23.583°E / 46.767; 23.583

Cluj-Napoca (Romanian pronunciation: [ˈkluʒ naˈpoka] ( listen); 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. In 1790–1848 and 1861–1867, it was the official capital of the Grand Principality of Transylvania.

As of 2011, 309,136 inhabitants live within the city limits, marking a decrease from the figure recorded at the 2002 census. The Cluj-Napoca metropolitan area has a population of 392,562 people, while the population of the peri-urban area (Romanian: zona periurbană) exceeds 400,000 residents. The new metropolitan government of Cluj-Napoca became operational in December 2008. Lastly, according to the 2007 data provided by the County Population Register Service, the total population of the city is as high as 392,276 people. However, this number does not include the floating population of students and other non-residents—an average of over 20,000 people each year during 2004–2007, according to the same source.