Moravia is a historical region in Central Europe in the east of the Czech Republic, and one of the former Czech lands, together with Bohemia and Silesia. It takes its name from the Morava River which rises in the northwest of the region. Moravia's largest city is Brno, its de-facto capital since the downfall of Olomouc during the Thirty Years' War. (source)
Thank you Radim!