North America is the third largest continent located between the Arctic Ocean to the north and the Isthmus of Panama to the south. It has four major physical divisions - the Western Cordilleras along the western coast consisting of mountain ranges like the Rockies, the Canadian Shield north of the Great Lakes containing the Hudson Bay, the Appalachian Mountains in the east, and the Central Lowlands containing fertile prairies between the mountain ranges. North America includes three large countries - Canada, the United States, and Mexico as well as other smaller nations in Central America.