The Atlanta metropolitan area, designated by the United States Office of Management and Budget as the Atlanta-Sandy Springs-Roswell, GA Metropolitan Statistical Area, and unofficially known as Metro Atlanta, is the most populous metro area in the U.S. state of Georgia and the ninth-largest metropolitan statistical area (MSA) in the United States. It is the core of the broader Atlanta--Athens-Clarke--Sandy Springs Combined Statistical Area. Its economic, cultural, and demographic center is Atlanta, Georgia's capital and largest city. The Atlanta Combined Statistical area spans up to 39 counties in north Georgia and had an estimated population of nearly 6.1 million people. Atlanta is considered an "alpha(-) world city". It is the second largest metropolitan region in the Southeast behind South Florida.
The United States is a country in the Northern Hemisphere, Western Hemisphere, and the Eastern Hemisphere. It consists of forty-eight contiguous states in North America, Alaska, a peninsula which forms the northwestern most part of North America, and Hawaii, an archipelago in the Pacific Ocean. There are several United States territories in the Pacific and Caribbean. The term "United States", when used in the geographical sense, means the continental United States, Alaska, Hawaii, Puerto Rico, Guam, and the Virgin Islands of the United States. The country shares land borders with Canada and Mexico and maritime (water) borders with Russia, Cuba, and the Bahamas in addition to Canada and Mexico.