Silesia has undergone a similar notional extension at its eastern extreme. Historically, it extended only as far as the Brynica River, which separates it from Zagłębie Dąbrowskie in the Lesser Poland region. However, to many Poles today, Silesia ("Śląsk") is understood to cover all of the area around Katowice, including Zagłębie. 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).