Arenberg Castle

The official language in Flemish Brabant is Dutch (as it is in the whole of Flanders), but a few municipalities are allowed to use French to communicate with their citizens; these are called the municipalities with linguistic facilities. Other such special municipalities can be found along the border between Flanders and Wallonia, and between Wallonia and the German-speaking area of Belgium. The fact that Halle-Vilvoorde surrounds Brussels (which is officially bilingual but whose inhabitants mostly speak French) makes for an interesting mix of both languages.