Uşak (Turkish pronunciation) is a city in the interior part of the Aegean Region of Turkey. The city has a population of 500,000 (2016 census) and is the capital of Uşak Province. The city was previously known by its Greek name of Ousakeion/Ουσάκειον. Uşak city is situated at a distance of 210 km (130 mi) from İzmir, the region's principal metropolitan center and port city. Benefiting from its location at the crossroads of the Central Anatolian plateau and the coastal Aegean Region, and from a climate and agricultural production incorporating elements of both of these zones, Uşak has also traditionally had a strong industrial base. Uşak was the first city in Turkey to have an urban electricity network, and the first city where a collective labor relations agreement was signed, during the Ottoman era, between leather industry employees and workers. It was here that the first factory of Republican Turkey, a sugar refinery, was set up through a private sector initiative among local businessmen. The tradition of industriousness continues today around two industrial zones.