A nation in southern North America is called Mexico. With a population of about 130 million, it is the tenth most populated country in the world and home to the greatest number of Spanish speakers. With an area of 1,972,550 km2 (761,610 sq mi), it is the 13th largest country in the world by area. One of the most populated metropolitan regions in the world, Mexico metropolis is the capital and largest metropolis of the country, which is structured as a federal constitutional republic with 31 states. In addition to ocean borders with the Pacific Ocean to the west, the Caribbean Sea to the southeast, and the Gulf of Mexico to the east, the nation shares land borders with the United States to the north, Guatemala, and Belize to the southeast.