| Harwich to Carmona | 1,054.28 mi (1,696.71 km) |
| Harwich to Cartagena | 996.38 mi (1,603.51 km) |
| Harwich to Cartama | 1,090.51 mi (1,755.01 km) |
| Harwich to Cartaya | 1,091.89 mi (1,757.23 km) |
| Harwich to Caspe | 741.88 mi (1,193.95 km) |
| Harwich to Cassa de la Selva | 698.11 mi (1,123.50 km) |
| Harwich to Castalla | 926.23 mi (1,490.62 km) |
| Harwich to Castellbisbal | 723.32 mi (1,164.06 km) |
| Harwich to Castelldefels | 736.88 mi (1,185.90 km) |
| Harwich to Castello de Ampurias | 673.87 mi (1,084.48 km) |
| Harwich to Castellon de la Plana | 828.05 mi (1,332.61 km) |
| Harwich to Castilleja de la Cuesta | 1,066.39 mi (1,716.19 km) |
| Harwich to Catarroja | 869.51 mi (1,399.34 km) |
| Harwich to Catral | 956.98 mi (1,540.12 km) |
| Harwich to Caudete | 920.49 mi (1,481.39 km) |
