The Upper Silesian metropolitan area is a polycentric metropolitan area in southern Poland and northeastern Czech Republic, centered on the cities of Katowice and Ostrava, and has around 5 million inhabitants. Geographically, it is located mainly in Upper Silesia, with small parts of the area also in the historical regions of Moravia and Lesser Poland. Administratively, it is located in the three administrative units : mainly Silesian Voivodeship and a small western part of Lesser Poland Voivodeship in Poland, and also a small eastern part of Moravian-Silesian Region in the Czech Republic.
Katowice in Silesian Voivodeship (Poland), the biggest city of the largest urban area in the Upper Silesian metropolitan area.