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 Mountain 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