| Difficult Run to Celano | 4,538.24 mi (7,303.59 km) |
| Difficult Run to Cento | 4,347.53 mi (6,996.67 km) |
| Difficult Run to Cepagatti | 4,550.36 mi (7,323.10 km) |
| Difficult Run to Ceprano | 4,555.79 mi (7,331.83 km) |
| Difficult Run to Cercola | 4,617.50 mi (7,431.15 km) |
| Difficult Run to Cerea | 4,329.06 mi (6,966.94 km) |
| Difficult Run to Cerese | 4,314.10 mi (6,942.87 km) |
| Difficult Run to Cerignola | 4,670.74 mi (7,516.82 km) |
| Difficult Run to Cermenate | 4,221.59 mi (6,793.99 km) |
| Difficult Run to Cernusco sul Naviglio | 4,238.17 mi (6,820.67 km) |
| Difficult Run to Cerreto Guidi | 4,362.84 mi (7,021.31 km) |
| Difficult Run to Cerro Maggiore | 4,219.07 mi (6,789.93 km) |
| Difficult Run to Certaldo | 4,377.14 mi (7,044.32 km) |
| Difficult Run to Cerveteri | 4,477.22 mi (7,205.39 km) |
| Difficult Run to Cervia | 4,409.68 mi (7,096.70 km) |
