Braine-Alleud is a French-speaking municipality in Belgium located in the Walloon Region in the province of Walloon Brabant. It is between Waterloo, Lasne, Genappe, Nivelles, Ittre and Braine-Le-Chateau
The town has nearly 40,000 inhabitants (called Brainois (es)), over an area of 5,199 ha 47a 88 ca. The most populous municipality in the province, it is located about twenty kilometers from Brussels. It brings together three former municipalities: Braine-l’Alleud, Ophain-Bois-Seigneur-Isaac and Lillois-Witterzée. Braine-l’Alleud takes its name from the Braine, the former name of Hain, a river that crosses its territory and of alleu, term which, in the Middle Ages, designated a freehold.