| Difficult Run to Miranda de Ebro | 3,771.67 mi (6,069.91 km) |
| Difficult Run to Mislata | 3,983.34 mi (6,410.56 km) |
| Difficult Run to Moana | 3,506.96 mi (5,643.91 km) |
| Difficult Run to Moguer | 3,735.08 mi (6,011.03 km) |
| Difficult Run to Molina de Segura | 3,988.54 mi (6,418.94 km) |
| Difficult Run to Molins de Rey | 4,038.98 mi (6,500.12 km) |
| Difficult Run to Mollerusa | 3,980.30 mi (6,405.67 km) |
| Difficult Run to Mollet | 4,044.33 mi (6,508.71 km) |
| Difficult Run to Moncada | 4,044.76 mi (6,509.41 km) |
| Difficult Run to Moncada | 3,982.14 mi (6,408.64 km) |
| Difficult Run to Monforte de Lemos | 3,560.04 mi (5,729.34 km) |
| Difficult Run to Monforte del Cid | 4,001.90 mi (6,440.43 km) |
| Difficult Run to Mongat | 4,049.60 mi (6,517.20 km) |
| Difficult Run to Monovar | 3,994.89 mi (6,429.16 km) |
| Difficult Run to Monserrat | 3,977.94 mi (6,401.87 km) |
