In addition to the three Regions, the Federal State has three Communities. They are based on the "language". So we talk about the Flemish, French and German-speaking Communities.
The territory of the Communities
The Flemish Community exercises its powers in the Flemish provinces and in Brussels, the French Community in the Walloon provinces, with the exception of German-speaking communes, and in Brussels, the German-speaking Community in the communes of the province of Liège that form the German language area.