| Rhondda to Melzo | 721.55 mi (1,161.22 km) |
| Rhondda to Mendicino | 1,270.29 mi (2,044.34 km) |
| Rhondda to Menfi | 1,253.57 mi (2,017.43 km) |
| Rhondda to Mentana | 1,004.54 mi (1,616.65 km) |
| Rhondda to Merano | 740.41 mi (1,191.58 km) |
| Rhondda to Merate | 713.28 mi (1,147.91 km) |
| Rhondda to Mercato San Severino | 1,141.71 mi (1,837.40 km) |
| Rhondda to Mercogliano | 1,133.80 mi (1,824.68 km) |
| Rhondda to Mesagne | 1,263.61 mi (2,033.58 km) |
| Rhondda to Messina | 1,304.75 mi (2,099.78 km) |
| Rhondda to Mestre | 829.22 mi (1,334.50 km) |
| Rhondda to Mestrino | 812.58 mi (1,307.72 km) |
| Rhondda to Milan | 714.72 mi (1,150.23 km) |
| Rhondda to Milazzo | 1,292.78 mi (2,080.52 km) |
| Rhondda to Minerbio | 837.42 mi (1,347.69 km) |
