Region
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Organ Mountains Wilderness (N.M.)
1
Pakistan
4
Persian Gulf Region
1
Poland
3
Rio Grande (Colo.-Mexico and Tex.)
1
Rio Grande Valley (Colo.-Mexico and Tex.)
1
Rwanda
4
San Diego
1
Scandinavia
2
South Asia
1
Southern boundary of the United States
4
Southwestern States
5
Syria
2
Texas
8
Tri-Border Area (Argentina, Brazil, and Paraguay)
2
Tucson Region
1
Ukraine
1
United Arab Emirates
1
United States
703
Welsh Borders (England and Wales)
4
Western Hemisphere
3