| Rhondda to Montijo | 891.35 mi (1,434.49 km) |
| Rhondda to Montilla | 971.37 mi (1,563.26 km) |
| Rhondda to Montmelo | 744.87 mi (1,198.76 km) |
| Rhondda to Montornes del Valles | 745.83 mi (1,200.30 km) |
| Rhondda to Montoro | 940.78 mi (1,514.04 km) |
| Rhondda to Monzon | 691.78 mi (1,113.32 km) |
| Rhondda to Mora | 824.59 mi (1,327.06 km) |
| Rhondda to Moralzarzal | 756.40 mi (1,217.31 km) |
| Rhondda to Moron de la Frontera | 1,006.34 mi (1,619.55 km) |
| Rhondda to Mostoles | 779.85 mi (1,255.04 km) |
| Rhondda to Motril | 1,027.15 mi (1,653.03 km) |
| Rhondda to Muchamiel | 923.46 mi (1,486.17 km) |
| Rhondda to Mula | 942.53 mi (1,516.85 km) |
| Rhondda to Munguia | 571.41 mi (919.59 km) |
| Rhondda to Murcia | 948.26 mi (1,526.07 km) |
