Region
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Boise River, Middle Fork (Idaho)
1
Bolivar
1
Bonner County
1
Boulder County
1
Bowman County
1
Brazil
1
Brewster County (Tex.)
1
British Indian Ocean Territory
2
Broken Ridge Region
2
Brooks Range
1
Buchanan County
1
Burlington Mine (Colo.)
1
Cabarrus County
4
California
57
California, Northern
2
Canon City Region
1
Canyonlands National Park
1
Caribbean Area
1
Caribou County
2
Carlin
2
Carson River Watershed
2
Cascade Range
1
Catoctin Mountain
1
Caura River Watershed
1
Cave Springs (Hamilton County, Tenn.)
1
Central Oklahoma Aquifer
1
Central Oklahoma Aquifer (Okla.)
2
Central Oklahoma Aquifer Region
1
Chaffee County
1
Chagres River Watershed (Panama)
1
Chamisa Wilderness (N.M.)
1
Chandler Lake Region
1
Chattanooga Region
1
Chesapeake Bay Watershed
1
Chesterfield County
1
Chignik Quadrangle
1
Chile
1
China
6
Chiricahua Mountains
2
Chisos Mountains
1
Chocó
1
Chugach Mountains Region
1
Cibola County
1
Clinton County
1
Coast Range
1
Coast Ranges
2
Cochise County
1
Coconino National Forest
1
Coeur d'Alene Lake
1
Coeur d'Alene Mining District
3
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