| Difficult Run to Montijo | 3,699.12 mi (5,953.16 km) |
| Difficult Run to Montilla | 3,835.33 mi (6,172.36 km) |
| Difficult Run to Montmelo | 4,045.57 mi (6,510.71 km) |
| Difficult Run to Montornes del Valles | 4,046.67 mi (6,512.49 km) |
| Difficult Run to Montoro | 3,834.72 mi (6,171.39 km) |
| Difficult Run to Monzon | 3,939.18 mi (6,339.51 km) |
| Difficult Run to Mora | 3,815.48 mi (6,140.41 km) |
| Difficult Run to Moralzarzal | 3,778.04 mi (6,080.16 km) |
| Difficult Run to Moron de la Frontera | 3,808.58 mi (6,129.32 km) |
| Difficult Run to Mostoles | 3,792.59 mi (6,103.59 km) |
| Difficult Run to Motril | 3,915.86 mi (6,301.97 km) |
| Difficult Run to Muchamiel | 4,014.60 mi (6,460.87 km) |
| Difficult Run to Mula | 3,975.44 mi (6,397.85 km) |
| Difficult Run to Munguia | 3,757.62 mi (6,047.30 km) |
| Difficult Run to Murcia | 3,994.70 mi (6,428.85 km) |
