| Difficult Run to Carpentras | 4,096.59 mi (6,592.83 km) |
| Difficult Run to Carquefou | 3,717.84 mi (5,983.29 km) |
| Difficult Run to Carqueiranne | 4,172.25 mi (6,714.59 km) |
| Difficult Run to Carrieres-sous-Poissy | 3,828.40 mi (6,161.21 km) |
| Difficult Run to Carrieres-sur-Seine | 3,839.90 mi (6,179.72 km) |
| Difficult Run to Carros | 4,200.67 mi (6,760.33 km) |
| Difficult Run to Carvin | 3,827.53 mi (6,159.82 km) |
| Difficult Run to Castanet-Tolosan | 3,952.73 mi (6,361.31 km) |
| Difficult Run to Castelginest | 3,944.63 mi (6,348.27 km) |
| Difficult Run to Castelnau-le-Lez | 4,057.94 mi (6,530.62 km) |
| Difficult Run to Castelnaudary | 3,979.23 mi (6,403.95 km) |
| Difficult Run to Castelsarrasin | 3,919.96 mi (6,308.56 km) |
| Difficult Run to Castres | 3,984.43 mi (6,412.32 km) |
| Difficult Run to Caudebec-les-Elbeuf | 3,777.17 mi (6,078.77 km) |
| Difficult Run to Caudry | 3,855.48 mi (6,204.80 km) |
