Spatial Coverage
- Calgary (Alta.)1
- Calgary.1
- Canada.1
- Cantabria (Spain)1
- Cantabria.1
- Cape Cod1
- Caribbean Area1
- Carson River Watershed (Nev.)1
- Cascade Range1
- Caspian Sea Region1
- Castile (Spain)1
- Castile.1
- Charlotte Amalie1
- Charlotte Harbor (Fla. : Bay)1
- Cheju Strait (Korea)1
- Chesapeake Bay Region (Md. and Va.)1
- Chewelah Region1
- Chippewa River Watershed1
- Chippewa River Watershed (Minn.)1
- Choctawhatchee Bay (Fla.)1
