| Merthyr Tudful to Marsala | 1,231.35 mi (1,981.67 km) |
| Merthyr Tudful to Marsciano | 952.13 mi (1,532.30 km) |
| Merthyr Tudful to Martano | 1,302.92 mi (2,096.84 km) |
| Merthyr Tudful to Martellago | 825.93 mi (1,329.20 km) |
| Merthyr Tudful to Martina Franca | 1,242.53 mi (1,999.65 km) |
| Merthyr Tudful to Martinengo | 734.35 mi (1,181.81 km) |
| Merthyr Tudful to Martinsicuro | 1,011.17 mi (1,627.32 km) |
| Merthyr Tudful to Mascali | 1,321.32 mi (2,126.46 km) |
| Merthyr Tudful to Mascalucia | 1,326.55 mi (2,134.88 km) |
| Merthyr Tudful to Masera di Padova | 824.39 mi (1,326.72 km) |
| Merthyr Tudful to Maserada sul Piave | 823.80 mi (1,325.78 km) |
| Merthyr Tudful to Massa | 819.69 mi (1,319.16 km) |
| Merthyr Tudful to Massa Lombarda | 860.71 mi (1,385.18 km) |
| Merthyr Tudful to Massafra | 1,240.21 mi (1,995.93 km) |
| Merthyr Tudful to Massalubrense | 1,139.14 mi (1,833.26 km) |
