counties including nearly (102,787–103,093 km2 in Hungarian sources and 102,282 km2 in contemporary Romanian documents). Nowadays, due to several administrative reorganisations, the territory covers 16 counties (Romanian: județ), with an area of , in central and northwest Romania. The 16 counties are: Alba, Arad, Bihor, Bistrița-Năsăud, Brașov, Caraș-Severin, Cluj, Covasna, Harghita, Hunedoara, Maramureș, Mureș, Sălaj, Satu Mare, Sibiu, and Timiș. Transylvania contains both largely urban counties, such as Brașov and Hunedoara counties, as well as largely rural ones, such as Bistrița-Năsăud and Sălaj counties. Since 1998, Romania has been divided into eight development regions, acting as divisions that coordinate and implement socio-economic development at regional level. Six counties (Alba, Brașov, Covasna, Harghita, Mureș and Sibiu) form the Centru development region, another six (Bihor, Bistrița-Năsăud, Cluj, Maramureș, Satu Mare, Sălaj) form the Nord-Vest development region, while four (Arad, Caraș-Severin, Hunedoara, Timiș) form the Vest development region. Cities Cluj-Napoca, commonly known as Cluj, is the second most populous city in Romania (as of the 2011 census), after the national capital Bucharest, and is the seat of Cluj County. From 1790 to 1848 and from 1861 to 1867, it was the official capital of the Grand Principality of Transylvania. Brașov is an important tourist destination, being the largest city in a mountain resorts area, and a central location, suitable for exploring Romania, with the distances to several tourist destinations (including the Black Sea resorts, the monasteries in northern Moldavia, and the wooden churches of Maramureș) being similar. Sibiu is one of the most important cultural centres of Romania and was designated the European Capital of Culture for the year 2007, along with the city of Luxembourg. It was formerly the centre of the Transylvanian Saxon culture and between 1692 and 1791 and 1849–65 was the capital of the Principality of Transylvania. Alba Iulia, a city located on the Mureș River in Alba County, has since the High Middle Ages been the seat of Transylvania's Roman Catholic diocese. Between 1541 and 1690 it was the capital of the Eastern Hungarian Kingdom and the later Principality of Transylvania. Alba Iulia also has historical importance: after the end of World War I, representatives of the Romanian population of Transylvania gathered in Alba Iulia on 1 December 1918 to proclaim the union of Transylvania with the Kingdom of Romania. In Transylvania, there are many medieval smaller towns such as Sighișoara, Mediaș, Sebeș, and Bistrița. Population Historical population