North America is a continent entirely within the Northern Hemisphere, and almost all within the Western Hemisphere. It can also be considered a northern subcontinent of the Americas. It is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the west and south by the Pacific Ocean, and to the southeast by South America and the Caribbean Sea.
The term Northern America refers to the northern-most countries and territories, such as: Canada, United States, Greenland, Bermuda, and St. Pierre and Miquelon. Although rarely used, the term Middle America groups the regions of Central America, the Caribbean, and Mexico.
Source: Wikipedia
CNS Travel Guides 