| Difficult Run to Carmona | 3,789.33 mi (6,098.33 km) |
| Difficult Run to Cartagena | 4,013.99 mi (6,459.89 km) |
| Difficult Run to Cartama | 3,861.78 mi (6,214.93 km) |
| Difficult Run to Cartaya | 3,719.31 mi (5,985.64 km) |
| Difficult Run to Caspe | 3,948.65 mi (6,354.73 km) |
| Difficult Run to Cassa de la Selva | 4,064.21 mi (6,540.71 km) |
| Difficult Run to Castalla | 3,998.04 mi (6,434.22 km) |
| Difficult Run to Castellbisbal | 4,035.51 mi (6,494.52 km) |
| Difficult Run to Castelldefels | 4,041.25 mi (6,503.76 km) |
| Difficult Run to Castello de Ampurias | 4,062.15 mi (6,537.40 km) |
| Difficult Run to Castellon de la Plana | 3,986.12 mi (6,415.05 km) |
| Difficult Run to Castilleja de la Cuesta | 3,771.12 mi (6,069.02 km) |
| Difficult Run to Catarroja | 3,986.08 mi (6,414.97 km) |
| Difficult Run to Catral | 4,005.11 mi (6,445.60 km) |
| Difficult Run to Caudete | 3,979.39 mi (6,404.22 km) |
