| Rhondda to Mombris | 558.65 mi (899.06 km) |
| Rhondda to Monchengladbach | 425.20 mi (684.29 km) |
| Rhondda to Monschau | 425.80 mi (685.26 km) |
| Rhondda to Montabaur | 494.82 mi (796.34 km) |
| Rhondda to Moosburg | 713.51 mi (1,148.29 km) |
| Rhondda to Morbach | 476.84 mi (767.40 km) |
| Rhondda to Morfelden-Walldorf | 535.08 mi (861.13 km) |
| Rhondda to Morlenbach | 550.15 mi (885.38 km) |
| Rhondda to Morsbach | 483.91 mi (778.78 km) |
| Rhondda to Mosbach | 573.26 mi (922.58 km) |
| Rhondda to Mosigkau | 668.72 mi (1,076.21 km) |
| Rhondda to Mossingen | 595.70 mi (958.69 km) |
| Rhondda to Much | 469.71 mi (755.93 km) |
| Rhondda to Mucheln | 654.31 mi (1,053.01 km) |
| Rhondda to Muhlacker | 570.81 mi (918.63 km) |
