| Difficult Run to Cabestany | 4,043.29 mi (6,507.05 km) |
| Difficult Run to Cabries | 4,130.29 mi (6,647.07 km) |
| Difficult Run to Cachan | 3,844.78 mi (6,187.57 km) |
| Difficult Run to Caen | 3,720.82 mi (5,988.08 km) |
| Difficult Run to Cagnes-sur-Mer | 4,202.15 mi (6,762.70 km) |
| Difficult Run to Cahors | 3,923.49 mi (6,314.24 km) |
| Difficult Run to Calais | 3,771.33 mi (6,069.36 km) |
| Difficult Run to Caluire-et-Cuire | 4,035.61 mi (6,494.68 km) |
| Difficult Run to Cambrai | 3,846.92 mi (6,191.01 km) |
| Difficult Run to Canet-en-Roussillon | 4,045.48 mi (6,510.57 km) |
| Difficult Run to Cannes | 4,199.71 mi (6,758.78 km) |
| Difficult Run to Canteleu | 3,773.62 mi (6,073.05 km) |
| Difficult Run to Capbreton | 3,815.18 mi (6,139.93 km) |
| Difficult Run to Carcassonne | 4,000.44 mi (6,438.09 km) |
| Difficult Run to Carmaux | 3,967.20 mi (6,384.60 km) |
