Miami is a major port city on the Atlantic coast of south Florida in the southeastern United States. As the seat of Miami-Dade County, the municipality is the principal, central, and the most populous city of the Miami metropolitan area and part of the second-most populous metropolis in the southeastern United States. According to the United States Census Bureau, Miami's metro area is the seventh-most populous and fourth-largest urban area in the U.S., with a population of around 5.5 million.
Miami is a major center, and a leader in finance, commerce, culture, media, entertainment, the arts, and international trade. In 2012, Miami was classified as an "Alpha−" level world city in the World Cities Study Group's inventory. In 2010, Miami ranked seventh in the United States and 33rd among global cities in terms of business activity, human capital, information exchange, cultural experience, and political engagement. In 2008, Forbes magazine ranked Miami "America's Cleanest City", for its year-round good air quality, vast green spaces, clean drinking water, clean streets, and citywide recycling programs.