| A | B |
|---|
| Lowlands along the Atlantic coast; excellent harbors | COASTAL PLAIN |
| Old eroded mountains; eastern U.S. | APPALACHIAN HIGHLANDS |
| Horshoe-shaped; wrapped around Hudson Bay; – Hills worn by erosion and hundreds of lakes carved by glaciers | CANADIAN SHIELD |
| Grassy flatlands with many rivers; between Appalachian Mtns and Great Plains | INTERIOR LOWLANDS |
| Tall grasses; flat but elevation rises to west; between Rocky Mtns and Interior Lowlands | GREAT PLAINS |
| High, rugged western mtns; Continental Divide | ROCKY MOUNTAINS |
| West of the Rockies, east of the Sierra Nevada and Cascade Mountains | BASIN AND RANGE |
| Rugged mountains with fertile valleys along Pacific Coast | COASTAL RANGE |
 | Appalachian Highlands |
 | Basin & Range Region |
 | Canadian Shield |
 | Coastal Plain |
 | Coastal Range |
 | Great Plains |
 | Interior Lowlands |
 | Rocky Mountains |
