| Term | Definition |
|---|
| Coastal Plain | Located along the Atlantic Ocean and Gulf of Mexico, Broad lowland providing many excellent harbors |
| Appalachian Highlands | Located west of Coastal Plain extending from eastern Canada to western Alabama; includes the Piedmont. Old, eroded mountains (oldest mountain range in North America) |
| Canadian Shield | Wrapped around Hudson Bay in a horseshoe shape, Hills worn by erosion and hundreds of lakes carved by glaciers, Holds some of the oldest rock formations in North America |
| Interior Lowlands | Located west of the Appalachian Mountains and east of the Great Plains, Rolling flatlands with many rivers, broad river valleys, and grassy hills |
| Great Plains | Located west of Interior Lowlands and east of the Rocky Mountains, Flat land that gradually increases in elevation westward; grasslands |
| Rocky Mountains | Located west of the Great Plains and east of the Basin and Range, Rugged mountains stretching from Alaska almost to Mexico at high elevations |
| Continental Divide | Located in the Rocky Mountain region, an imaginary line that determines the directional flow of rivers |
| Basin and Range | Located west of Rocky Mountains and east of the Sierra Nevadas and the Cascades, Area of varying elevations containing isolated mountain ranges and Death Valley, the lowest point in North America |
| Coastal Range | Rugged mountains along the Pacific Coast that stretch from California to Canada, Contains fertile valleys |
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