America's regions:
The vegetation patterns in infrared spectrum	Predominant water systems

Pollution levels

Eastern Physiographic Provinces map

Substantial regions of the country

Eastern Seaboard
Tidewater
Piedmont
Appalachian plateau
fall line
Ohio River Valley
Great Lakes
Cumberland plateau
Mississippi Valley
Great Plains
High Plains
Gulf Plain
Western
Rocky Mountains
Great Basin
Sonoran Desert
Sierra Nevada Range
Great Central Valley
California Coast
Pacific Northwest
Puget Sound
Columbia River Valley
North Pacific Coast
Alaskan Coast
Southeast Alaska
Yukon River Valley
North slope / Arctic Coast

Western Physiographic Provinces map