- Cairo, Egypt1
- Calaveras River, Calaveras County, California, United States1
- Caldbeck Fells, Cumberland, Cumbria, England, United Kingdom1
- Campania, Rome Province, Italy1
- Canada to North Carolina1
- Canada to Texas1
- Canning, Kings County, Nova Scotia, Canada1
- Cape Cod, Barnstable County, Massachusetts, United States1
- Cape Verde Islands, Cape Verde, Africa1
- Cape of Good Hope, Western Cape, South Africa1
- Carbon (Northampton) County, Pennsylvania, United States1
- Castleton, Derbyshire, England, United Kingdom1
- Cayuga Lake, New York, United States1
- Cayuga River, New York, United States1
- Chapel Hill, Orange County, North Carolina, United States1
- Charleston Harbor, Charleston County, South Carolina, United States1
- Charleston Harbor, Charleston, Charleston County, South Carolina, United States1
- Charleston Neck, Charleston County, South Carolina, United States1
- Charleston, Charleston County, South, Carolina, United States1
- Charlotte Harbor, Charleston County, South Carolina, United States1