 This interpretation is given official sanction in the use of the name Silesian Voivodeship ("województwo śląskie") for the province covering this area.In fact, the word "Śląsk" in Polish (when used without qualification) now commonly refers exclusively to this area (also called "Górny Śląsk" or Upper Silesia).As well as the Katowice area, historical Upper Silesia also includes the Opole region (Poland's Opole Voivodeship) and Czech Silesia.