The United States of America, commonly known as the United States or America, is a country primarily located in North America. The third-largest in the world by land and total area, the U.S. consists of 50 states, a federal district, five major unincorporated territories, nine Minor Outlying Islands and includes 326 Indian reservations. It shares land borders with Canada to its north and with Mexico to its south and has maritime borders with the Bahamas, Cuba, Russia, and other nations.