Brussels is a region of Belgium comprising 19 municipalities, including the City of Brussels which is the capital of Belgium. The Brussels-Capital Region is a part of both the French Community of Belgium and the Flemish Community, but is separate from the region of Flanders or Wallonia. The region has a population of 1.2 million and a metropolitan area with a population of over 1.8 million, the largest in Belgium. Since the end of the Second World War, Brussels has been a major centre for international politics and has become the home of numerous international organizations, politicians, diplomats and civil servants. Brussels is the de facto capital of the European Union as it hosts a number of principal EU institutions. The secretariat of the Benelux and the headquarters of the North Atlantic Treaty Organization are also located in Brussels.