Save Type Region Usage English, Spanish, Ancient Roman Meaning & HistoryExpand Links From Mount Ślęża or the River Ślęza. This is the name of a historical region in southern Poland, with portions in the Czech Republic and Germany. Related NamesFamily Tree·Details Other Languages & CulturesSlezsko(Czech) Silésie(French) Schlesien(German) Śląsk, Ślęża, Ślęza(Polish) Sliezsko(Slovak)