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Region
- Africa, North1
- AlaskaAnchorage Region2
- AlaskaNorth Slope1
- ArizonaGrand Canyon National Park1
- ArizonaPalisades Creek1
- Atlantic Coast (U.S.)1
- Beaufort Sea1
- Black Hills (S.D. and Wyo.)1
- California7
- CaliforniaSan Mateo County3
- Colorado1
- East (U.S.)1
- Eurasia1
- Europe1
- Fishers Island Sound (Conn. and N.Y.)1
- FloridaKey Largo Region1
- Georges Bank2
- Idaho3
- IdahoSalmon Region1
- Mars (Planet)1