Brussels, Flemish Brussel, French Bruxelles, city, capital of Belgium. It is located in the valley of the Senne (Flemish: Zenne) River, a small tributary of the Schelde (French: Escaut). Greater Brussels is the country’s largest urban agglomeration. It consists of 19 communes, or municipalities, each with a large measure of administrative autonomy. The largest commune—which, like the greater metropolitan area, is named Brussels—contains the historic core of the city and the so-called “European Quarter,” where the institutions of the European Union (EU) are located. Greater Brussels officially became the Brussels-Capital Region in 1989, during the federalization of Belgium. Along with the much larger regions of Flanders and Wallonia, the Brussels-Capital Region constitutes one of the country’s three main political divisions. As the seat of the EU, Brussels is known as the “capital of Europe,” and its significance as a centre of international governance and business makes Brussels a true global city—a status shared with such metropolises as New York, London, Paris, and Tokyo. Area Brussels-Capital Region, 62 square miles (161 square km). Pop. (2015 est.) Brussels-Capital Region, 1,175,173; Brussels commune, 175,534.