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Region
- Maryland, Southern4
- Bosnia and Herzegovina2
- Congo (Democratic Republic)2
- Delaware2
- Denmark2
- Dominican Republic2
- Mississippi River2
- Patapsco Aquifer2
- Alaska1
- Aquia Formation1
- ArkansasMississippi County1
- AustraliaDarwin (N.T.)1
- Black Hills (S.D. and Wyo.)1
- CaliforniaMojave River Watershed1
- CaliforniaSan Bernardino County1
- CaliforniaSanta Cruz County1
- Dakar (Senegal)1
- Darwin (N.T.)1
- Djibouti1
- Dominica1