Mexico City, is the capital and largest city of Mexico and the most populous city in North America. Mexico City is one of the most important cultural and financial centres in the world. 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 meters. The city has 16 subdivisions, formerly known as boroughs.
The 2009 population for the city proper was approximately 8.84 million people, with a land area of 1,485 square kilometers. 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 second largest metropolitan area of the Western Hemisphere, the eleventh-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 most productive urban 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.