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Region
- Long Island Sound (N.Y. and Conn.)6
- Appalachian Basin5
- Massachusetts5
- CaliforniaKern County2
- CaliforniaSan Bernardino County2
- IndianaVanderburgh County2
- KentuckyHenderson County2
- New Jersey2
- TennesseeShelby County2
- Wabash River Valley2
- Afghanistan1
- AlaskaAlaska Peninsula1
- AlaskaGates of the Arctic National Park and Preserve1
- AlaskaNoatak National Preserve1
- AlaskaTanacross Region1
- Animas River Watershed (Colo. and N.M.)1
- Arizona1
- ArkansasCrittenden County1
- Bear Lake Valley (Utah and Idaho)1
- Bear River Watershed (Utah-Idaho)1