North America can be divided into 4 major natural regions (each of which contains many sub-regions). The highest point of North America is Denali Peak in Alaska.
The major physical regions are:
1. The Great Plains stretching from Gulf of Mexico to the Canadian Arctic.
2. The Western Mountains including Rocky Mountains, the Great Basin (a lower area containing smaller ranges and low-lying deserts), California and Alaska.
3. The Canadian Shield (or Laurentian Plateau) which is a plateau region underlain by ancient crystalline rocks.
4. Varied Eastern Region that includes Appalachian Mountains, Coastal Plain along the Atlantic seaboard, Florida Peninsular, etc.
The drainage system of North America can be divided into: -
1. The Great Lakes-St. Lawrence River System that drains the northern part of the North America.
2. Mississippi-Missouri River System that drains the central as well as the southern section and is the lifeline of the Great Plains.
3. Mackenzie River System of the Western Canada.