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Region
- American SamoaAunuu Island1
- ArizonaPima County1
- ArizonaSalt River Indian Reservation1
- Arkansas2
- British Indian Ocean TerritoryDiego Garcia1
- Colorado2
- Columbia Plateau2
- Diego Garcia (British Indian Ocean Territory)1
- Florida1
- FloridaEscambia County1
- FloridaSanta Rosa County1
- High Plains Aquifer1
- IndianaLaPorte County1
- IndianaSaint Joseph County1
- KentuckyLouisville1
- Louisiana2
- Marshall IslandsKwajalein Atoll1
- Marshall IslandsKwajalein Island1
- MichiganBerrien County1
- MichiganCass County1