Miami is a global city in southeastern Florida, in the United States. Miami is ranked as a global city for its importance in finance, commerce, media, entertainment, arts and international trade. The city is home to many company headquarters, banks, and television studios. It is an international center for popular entertainment in television, music, fashion, film, and the performing arts. The city's Port of Miami is known for accommodating the largest volume of cruise ships in the world and is home to many cruise line headquarters. Miami is also home to the largest concentration of international banks in the United States. In 2008, Miami was ranked as "America's Cleanest City" according to Forbes Magazine for its year-round good air quality, vast green spaces, clean drinking water, clean streets and city-wide recycling programs. In 2008, Miami was also ranked the 3rd-richest city in the United States and the world's 22nd-richest city in a UBS study. In 2008, Miami was ranked as "America's Cleanest City" according to Forbes Magazine for its year-round good air quality, vast green spaces, clean drinking water, clean streets and city-wide recycling programs. In 2008, Miami was also ranked the 3rd- richest city in the United States and the world's 22nd-richest city in a UBS study.