Braine-l'Alleud is a Walloon municipality in the Belgian province of Walloon Brabant, about 20 kilometers south of Brussels. The Braine-l'Alleud municipality includes the former municipalities of Braine-l'Alleud proper, Ophain-Bois-Seigneur-Isaac, and Lillois-Witterzée. It also includes the hamlet of Sart-Moulin, the inverted name of which inspired Hergé’s Moulinsart castle. The famous Lion of Waterloo where the eponymous battle took place is in the territory of Braine-l'Alleud. Bordering Flanders, the town is home to a minority of Dutch-speakers.