| Merthyr Tudful to Massarosa | 834.87 mi (1,343.59 km) |
| Merthyr Tudful to Matelica | 960.16 mi (1,545.22 km) |
| Merthyr Tudful to Matera | 1,217.10 mi (1,958.74 km) |
| Merthyr Tudful to Matino | 1,304.88 mi (2,100.01 km) |
| Merthyr Tudful to Mazzarino | 1,314.24 mi (2,115.07 km) |
| Merthyr Tudful to Meda | 707.96 mi (1,139.35 km) |
| Merthyr Tudful to Medesano | 785.27 mi (1,263.76 km) |
| Merthyr Tudful to Medicina | 852.40 mi (1,371.80 km) |
| Merthyr Tudful to Meldola | 883.86 mi (1,422.44 km) |
| Merthyr Tudful to Melegnano | 727.73 mi (1,171.17 km) |
| Merthyr Tudful to Melendugno | 1,300.91 mi (2,093.61 km) |
| Merthyr Tudful to Melfi | 1,165.97 mi (1,876.44 km) |
| Merthyr Tudful to Melilli | 1,350.08 mi (2,172.75 km) |
| Merthyr Tudful to Melito di Napoli | 1,119.63 mi (1,801.87 km) |
| Merthyr Tudful to Melito di Porto Salvo | 1,331.57 mi (2,142.96 km) |
