| Difficult Run to Busto Arsizio | 4,214.47 mi (6,782.53 km) |
| Difficult Run to Busto Garolfo | 4,218.01 mi (6,788.23 km) |
| Difficult Run to Cabras | 4,388.44 mi (7,062.50 km) |
| Difficult Run to Cadelbosco di Sopra | 4,317.06 mi (6,947.64 km) |
| Difficult Run to Cadoneghe | 4,351.14 mi (7,002.48 km) |
| Difficult Run to Cagli | 4,446.90 mi (7,156.60 km) |
| Difficult Run to Cagliari | 4,439.52 mi (7,144.72 km) |
| Difficult Run to Cairo Montenotte | 4,227.84 mi (6,804.05 km) |
| Difficult Run to Caivano | 4,612.22 mi (7,422.66 km) |
| Difficult Run to Calcinaia | 4,354.05 mi (7,007.16 km) |
| Difficult Run to Calcinato | 4,286.31 mi (6,898.15 km) |
| Difficult Run to Calderara di Reno | 4,352.42 mi (7,004.54 km) |
| Difficult Run to Caldogno | 4,327.53 mi (6,964.48 km) |
| Difficult Run to Calenzano | 4,371.76 mi (7,035.67 km) |
| Difficult Run to Calolziocorte | 4,233.36 mi (6,812.93 km) |
