The term "Manila" is commonly used to refer to the whole metropolitan area, the greater metropolitan area or the city proper. The officially defined metropolitan area, called Metro Manila, the "capital region" of the Philippines, also includes the much larger Quezon City and the Makati Central Business District. It is the most populous region in the country, one of the most populous urban areas in the world, and is one of the wealthiest regions in Southeast Asia. The city proper was home to  people in , and is the historic core of a built-up area that extends well beyond its administrative limits. With 71,263 people per square kilometer, Manila is the most densely populated city proper in the world.