Mexico City, or the City of Mexico, is the capital and most populous city of Mexico. Mexico City is one of the most important financial centers in the Americas. It is located in the Valley of Mexico (Valle de México), a large valley in the high plateaus at the center of Mexico, at an altitude of 2240m. The city consists of sixteen municipalities.The 2009 estimated population for the city proper was approximately 8.84 million people, with a land area of 1485 km2. According to the most recent definition agreed upon by the federal and state governments, the Greater Mexico City population is 21.3 million people, making it the largest metropolitan area of the Western Hemisphere, the tenth-largest agglomeration, and the largest Spanish-speaking city in the world.Greater Mexico City has a GDP of $411 billion in 2011, making Mexico City urban agglomeration one of the largest metropolitan areas in the world. The city was responsible for generating 15.8% of Mexico's GDP and the metropolitan area accounted for about 22% of total national GDP. As a stand-alone country, in 2013, Mexico City would be the fifth-largest economy in Latin America—five times as large as Costa Rica and about the same size as Peru.