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Region
- Black Hills (S.D. and Wyo.)3
- Floridan Aquifer3
- AlaskaKobuk River Valley1
- ArizonaBlack Mesa Region (Navajo County and Apache County)1
- Arkansas1
- ArkansasBear Creek (Van Buren County and Searcy County)1
- ArkansasBuffalo River1
- Colonel's Island (Ga.)1
- ColoradoElkhead Creek1
- ColoradoJefferson County1
- ColoradoMuddy Creek (Gunnison County)1
- ColoradoWolford Mountain Reservoir1
- ConnecticutNepaug Reservoir Region1
- Florida1
- FloridaMartin County1
- FloridaOrange County1
- FloridaSaint Lucie County1
- Gates of the Arctic National Park and Preserve (Alaska)1
- GeorgiaAlbany Region1
- GeorgiaColonel's Island1