Northern America's land frontier with the rest of North America coincides with the Mexico–United States border. Geopolitically, according to the United Nations' scheme of geographic regions and subregions, Northern America consists of Bermuda, Canada, Greenland, Saint Pierre and Miquelon, and the United States (Mainland United States and Alaska only, excluding Hawaii, Navassa Island, Puerto Rico, the United States Virgin Islands and other minor U.S. Pacific territories).