| Harpenden to Cermik | 2,128.16 mi (3,424.95 km) |
| Harpenden to Cesme | 1,585.61 mi (2,551.79 km) |
| Harpenden to Ceyhan | 2,026.72 mi (3,261.69 km) |
| Harpenden to Ceylanpinar | 2,210.72 mi (3,557.81 km) |
| Harpenden to Cicekdagi | 1,853.49 mi (2,982.90 km) |
| Harpenden to Cide | 1,699.78 mi (2,735.54 km) |
| Harpenden to Cifteler | 1,724.53 mi (2,775.36 km) |
| Harpenden to Ciftlik | 1,920.16 mi (3,090.20 km) |
| Harpenden to Ciftlikkoy | 1,598.35 mi (2,572.29 km) |
| Harpenden to Cihanbeyli | 1,834.19 mi (2,951.84 km) |
| Harpenden to Cildir | 2,159.56 mi (3,475.48 km) |
| Harpenden to Cilimli | 1,659.04 mi (2,669.97 km) |
| Harpenden to Cinar | 2,186.84 mi (3,519.37 km) |
| Harpenden to Cinarcik | 1,590.84 mi (2,560.21 km) |
| Harpenden to Cine | 1,688.31 mi (2,717.08 km) |
