United States physiographic region

USGS map colored by paleogeological areas and demarcating the sections of the U.S physiographic regions: Laurentian Upland (area 1), Atlantic Plain (2-3), Appalachian Highlands (4-10), Interior Plains (11-13), Interior Highlands (14-15), Rocky Mountain System (16-19), Intermontane Plateaus (20-22), & Pacific Mountain System (23-25)

File:Physiographic legend.jpg

The legend of paleogeological color also depicts topographic terrain.

Main articles: Geography of the United States and Physiographic regions of the world

This list of physiographic regions of the contiguous United States identifies the 8 regions, 25 provinces, and 85 sections. The system dates to Nevin Fenneman's paper Physiographic Subdivision of the United States, published in 1917. Fenneman expanded and presented his system more fully in two books, Physiography of western United States (1931), and Physiography of eastern United States (1938). In these works Fenneman described 25 provinces and 85 sections of the United States physiography.

Physiographic divisions

Region	Province	Section
I. Laurentian Upland	1. Superior Upland
II. 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
III. Appalachian Highlands	4. Piedmont	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
IV. Interior Plains	11. Interior Low Plateaus	11a. Highland Rim
		11b. Lexington Plain
		11c. Nashville Basin
	12. Central Lowland	12a. Eastern Lake
		12b. Western Lake
		12c. Wisconsin Driftless
		12d. Till Plains
		12e. Dissected Till Plains
		12f. Osage Plains
	13. Great Plains	13a. Missouri Plateau (glaciated)
		13b. Missouri Plateau (unglaciated)
		13c. Black Hills
		13d. High Plains
		13e. Plains Border
		13f. Colorado Piedmont
		13g. Raton
		13h. Pecos Valley
		13i. Edwards Plateau
		13j. Central Texas
V. Interior Highlands	14. Ozark Plateaus	14a. Springfield-Salem plateaus
		14b. Boston Mountains
	15. Ouachita province	15a. Arkansas Valley
		15b. Ouachita Mountains
VI. Rocky Mountain System	16. Southern Rocky Mountains
	17. Wyoming Basin
	18. Middle Rocky Mountains
	19. Northern Rocky Mountains
VII. 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 section
		22b. Sonoran Desert
		22c. Salton Trough
		22d. Mexican Highland
		22e. Sacramento section
VIII. Pacific Mountains	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—(Transverse Ranges)"
	25. Lower California province—(Peninsular Ranges)