| Merthyr Tudful to Marasesti | 1,438.43 mi (2,314.93 km) |
| Merthyr Tudful to Marghita | 1,185.07 mi (1,907.19 km) |
| Merthyr Tudful to Marginea | 1,321.78 mi (2,127.20 km) |
| Merthyr Tudful to Matca | 1,452.33 mi (2,337.30 km) |
| Merthyr Tudful to Medgidia | 1,537.34 mi (2,474.12 km) |
| Merthyr Tudful to Media | 1,307.14 mi (2,103.65 km) |
| Merthyr Tudful to Miercurea-Ciuc | 1,362.44 mi (2,192.64 km) |
| Merthyr Tudful to Mioveni | 1,371.83 mi (2,207.75 km) |
| Merthyr Tudful to Mizil | 1,433.91 mi (2,307.65 km) |
| Merthyr Tudful to Moinesti | 1,389.27 mi (2,235.81 km) |
| Merthyr Tudful to Moisei | 1,270.71 mi (2,045.02 km) |
| Merthyr Tudful to Moldova Noua | 1,242.70 mi (1,999.93 km) |
| Merthyr Tudful to Moreni | 1,400.81 mi (2,254.39 km) |
| Merthyr Tudful to Motru | 1,294.25 mi (2,082.89 km) |
| Merthyr Tudful to Murfatlar | 1,546.31 mi (2,488.54 km) |
