Encyclopedia > Physiographic Regions of the United States
Physiographic Regions of the United States
There are eight distinct physiographic divisions within the contential U.S., though each is composed of yet small physiographic subdivisions. These major divisions are the:
- Laurentian Highlands (areas labelled 1)
- Atlantic Plain (labelled 2 and 3)
- Appalachian Highlands (labelled 4-10)
- Interior Plains (labelled 11-13)
- Interior Highlands (labelled 14 and 15)
- Rocky Mountain System (labelled 16-19)
- Intermontane Plateaus (labelled 20-22)
- Pacific Mountain System (labelled 23-25)
The map below shows these divisions together with their subdivisions.
| US Physiographic Regions - USGS |
LAURENTIAN UPLAND1. Superior Upland
ATLANTIC PLAIN2. Continental Shelf (not on map)3. Coastal Plain
APPALACHIAN HIGHLANDS4. Piedmont province
5. Blue Ridge province
6. Valley and Ridge province
7. St. Lawrence Valley
8. Appalachian Plateaus province
9. New England Province
10. Adirondack province
INTERIOR PLAINS11. Interior Low Plateaus
12. Central Lowland
13. Great Plains province
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INTERIOR HIGHLANDS14. Ozark Plateaus
15. Ouachita province
ROCKY MOUNTAIN SYSTEM16. Southern Rocky Mountains17. Wyoming Basin 18. Middle Rocky Mountains 19. Northern Rocky Mountains
INTERMONTANE PLATEAUS20. Columbia Plateau
21. Colorado Plateaus
22. Basin and Range province
PACIFIC MOUNTAIN SYSTEM23. Cascade-Sierra Mountains
24. Pacific Border province
25. Lower California province
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| Courtesy of USGS |
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