| Merthyr Tudful to Lubbeek | 359.74 mi (578.94 km) |
| Merthyr Tudful to Lummen | 373.54 mi (601.15 km) |
| Merthyr Tudful to Maaseik | 397.02 mi (638.94 km) |
| Merthyr Tudful to Machelen | 342.10 mi (550.55 km) |
| Merthyr Tudful to Maldegem | 295.43 mi (475.45 km) |
| Merthyr Tudful to Malmedy | 417.65 mi (672.13 km) |
| Merthyr Tudful to Manage | 340.90 mi (548.62 km) |
| Merthyr Tudful to Marche-en-Famenne | 393.08 mi (632.59 km) |
| Merthyr Tudful to Mariakerke | 307.40 mi (494.71 km) |
| Merthyr Tudful to Mechelen | 342.27 mi (550.83 km) |
| Merthyr Tudful to Mechelen-aan-de-Maas | 394.80 mi (635.36 km) |
| Merthyr Tudful to Meerhout | 366.64 mi (590.06 km) |
| Merthyr Tudful to Meise | 337.35 mi (542.92 km) |
| Merthyr Tudful to Melle | 313.70 mi (504.85 km) |
| Merthyr Tudful to Melsele | 331.39 mi (533.32 km) |
