See Maps of the Region.
Reference for the physical geography of the Border Region: McKnight, Tom L. Regional Geography of the United States and Canada. New Jersey: Prentice Hall, 1992. Chapters 11,13,14, 15, and 16.
The U.S./Mexico Border Region includes four geographic sub-regions:
- Pacific Coast Continental Borderland
- Basin and Range
- Great Plains
- Gulf Plains (Gulf of Mexico)