Mexico City, or the City of Mexico, is the capital of Mexico and the most populous city in North America. Mexico City is one of the most important cultural and financial centers in the Americas. It is located in the Valley of Mexico, a large valley in the high plateaus in the center of Mexico, at an altitude of 2,240 metres. The city has 16 boroughs.
The 2009 population for the city proper was approximately 8.84 million people, with a land area of 1,485 square kilometres. According to the most recent definition agreed upon by the federal and state governments, the population of Greater Mexico City is 21.3 million, which makes 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 Greater Mexico City 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.