| Rhondda to Miranda de Ebro | 617.60 mi (993.93 km) |
| Rhondda to Mislata | 851.15 mi (1,369.79 km) |
| Rhondda to Moana | 691.67 mi (1,113.13 km) |
| Rhondda to Moguer | 1,004.86 mi (1,617.16 km) |
| Rhondda to Molina de Segura | 943.07 mi (1,517.73 km) |
| Rhondda to Molins de Rey | 750.21 mi (1,207.35 km) |
| Rhondda to Mollerusa | 719.24 mi (1,157.50 km) |
| Rhondda to Mollet | 745.46 mi (1,199.70 km) |
| Rhondda to Moncada | 748.27 mi (1,204.23 km) |
| Rhondda to Moncada | 846.49 mi (1,362.29 km) |
| Rhondda to Monforte de Lemos | 657.37 mi (1,057.93 km) |
| Rhondda to Monforte del Cid | 923.78 mi (1,486.67 km) |
| Rhondda to Mongat | 751.11 mi (1,208.79 km) |
| Rhondda to Monovar | 919.10 mi (1,479.15 km) |
| Rhondda to Monserrat | 857.70 mi (1,380.34 km) |
