Region
Mexico
Baja California (Peninsula)
5
California, Southern
2
Heroica Caborca
2
Sonora (State)
2
Texas
2
United States
2
Baja California (Mexico : Peninsula)
1
Coahuila (State)
1
Coast Ranges
1
East (U.S.)
1
Iztaccíhuatl
1
Mexico, Valley of
1
Pacific Coast (North America)
1
Tehuantepec, Isthmus of
1
Transverse Volcanic Range
1