| Difficult Run to Masanasa | 3,986.17 mi (6,415.12 km) |
| Difficult Run to Masquefa | 4,026.85 mi (6,480.60 km) |
| Difficult Run to Matadepera | 4,033.61 mi (6,491.47 km) |
| Difficult Run to Mazarron | 3,997.84 mi (6,433.90 km) |
| Difficult Run to Meco | 3,812.25 mi (6,135.22 km) |
| Difficult Run to Medina del Campo | 3,715.50 mi (5,979.51 km) |
| Difficult Run to Medina Sidonia | 3,805.08 mi (6,123.68 km) |
| Difficult Run to Mejorada del Campo | 3,813.87 mi (6,137.83 km) |
| Difficult Run to Meliana | 3,984.92 mi (6,413.11 km) |
| Difficult Run to Mengibar | 3,864.38 mi (6,219.11 km) |
| Difficult Run to Merida | 3,713.35 mi (5,976.07 km) |
| Difficult Run to Miajadas | 3,719.36 mi (5,985.74 km) |
| Difficult Run to Mieres | 3,623.77 mi (5,831.90 km) |
| Difficult Run to Miguelturra | 3,827.91 mi (6,160.43 km) |
| Difficult Run to Mijas | 3,865.04 mi (6,220.19 km) |
