U.S. Physical Geography
- California. Department of Corrections and Rehabilitation. San Quentin State Prison
- Cape Cod
- Cascade Range
- Catskill Mountains
- Cherokee Strip
- clinch
- Colorado River (North America)
- Continental Divide
- Cordilleras
- Corn Belt
- Cumberland
- Cumberland Gap
- Cumberland Road
- Dallas
- Death Valley
- Dismal Swamp
- Dust Bowl
- Ecological stress
- Erie Canal
- Everglades