The southwestern United States is defined based on ecological
zones, elevation, and arid conditions.
- Map of Southwestern United States and description:
- MapQuest.com
- navigatable map of Southwestern United States.
- Unites
States Department of the Interior National Atlas - allows
you to zoom in on states and regions and apply layers of data
to the map, including agricultural, biological, boundaries, climate,
environment, geology, people, transportation and water.
State Map Links (from The University of Texas at Austin):
Arizona, New
Mexico, Texas,
California,
Nevada,
and Utah
Ecological Zones:
- Sonoran Desert
- Sonoran Desert Naturalist
page
- Desert
Dwellers
-
Chihuahuan Desert
- Chihuahan Desert
Home Page
The Chihuahan Desert Region
Digital
Desert Library
-
Mojave Desert
- United States Department
of the Interior Mohave Desert Site
Mohave Desert
Regions Index
-
- USDA Plant Hardiness
Zone Map
- The
1998 US National Arboretum "Web Version" of the USDA
Plant Hardiness Zone Map
- Arizona Climatic Zones and Map
-
- An interactive map of Arizona climate zones.
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