Physiographic Regions of the United States - Definition 

There are eight distinct U. S. physiographic region within the continental United States. Each is composed of smaller physiographic subdivisions.

Continental U.S physiographic regions (image courtesy of the ).
Continental U.S physiographic regions (image courtesy of the USGS).
Legend for map (click to enlarge)
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Legend for map (click to enlarge)

These eight regions are:

See Physical geography of the U.S. for descriptions.

Laurentian Highlands

1. Superior Upland

Atlantic Plain

2. Continental Shelf (not on map)

3. Coastal Plain

3a. Embayed section
3b. Sea Island section
3c. Floridian section
3d. East Gulf Coastal Plain
3e. Mississippi Alluvial Plain
3f. West Gulf Coastal Plain

Appalachian Highlands

4. Piedmont province

4a. Piedmont Upland
4b. Piedmont Lowlands

5. Blue Ridge province

5a. Northern section
5b. Southern section

6. Valley and Ridge province

6a. Tennessee section
6b. Middle section
6c. Hudson Valley

7. St. Lawrence Valley

7a. Champlain section
7b. Northern section (not on map)

8. Appalachian Plateaus province

8a. Mohawk section
8b. Catskill section
8c. Southern New York section
8d. Allegheny Plateau section
8e. Kanawha section
8f. Cumberland Plateau section
8g. Cumberland Mountain section

9. New England Province

9a. Seaboard Lowland section
9b. New England Upland section
9c. White Mountain section
9d. Green Mountain section
9e. Taconic section

10. Adirondack province

Interior Plains

11. Interior Low Plateaus

11a. Highland Rim section
11b. Lexington Plain
11c. Nashville Basin

12. Central Lowland

12a. Eastern Lake section
12b. Western Lake section
12c. Wisconsin Driftless section
12d. Till Plains
12e. Dissected Till Plains
12f. Osage Plains

13. Great Plains province

13a. Missouri Plateau, glaciated
13b. Missouri Plateau, unglaciated
13c. Black Hills
13d. High Plains
13e. Plains Border
13f. Colorado Piedmont
13g. Raton section
13h. Pecos Valley
13i. Edwards Plateau
13j. Central Texas section

Interior Highlands

14. Ozark Plateaus

14a. Springfield-Salem plateaus
14b. Boston Mountains

15. Ouachita province

15a. Arkansas Valley
15b. Ouachita Mountains

Rocky Mountain System

16. Southern Rocky Mountains

17. Wyoming Basin

18. Middle Rocky Mountains

19. Northern Rocky Mountains

Intermontane Plateaus

20. Columbia Plateau

20a. Walla Walla Plateau
20b. Blue Mountain section
20c. Payette section
20d. Snake River Plain
20e. Harney section

21. Colorado Plateaus

21a. High Plateaus of Utah
21b. Uinta Basin
21c. Canyon Lands
21d. Navajo section
21e. Grand Canyon section
21f. Datil section

22. Basin and Range province

22a. Great Basin
22b. Sonoran Desert
22c. Salton Trough
22d. Mexican Highland
22e. Sacramento section

Pacific Mountain System

23. Cascade-Sierra Mountains

23a. Northern Cascade Mountains
23b. Middle Cascade Mountains
23c. Southern Cascade Mountains
23d. Sierra Nevada

24. Pacific Border province

24a. Puget Trough
24b. Olympic Mountains
24c. Oregon Coast Range
24d. Klamath Mountains
24e. California Trough
24f. California Coast Ranges
24g. Los Angeles Ranges

25. Lower California province

External link and source


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