| Riom to Marco de Canavezes | 650.37 mi (1,046.66 km) |
| Riom to Marinha Grande | 742.25 mi (1,194.53 km) |
| Riom to Massama | 800.66 mi (1,288.53 km) |
| Riom to Matosinhos | 674.27 mi (1,085.14 km) |
| Riom to Mealhada | 695.19 mi (1,118.81 km) |
| Riom to Melgaco | 622.06 mi (1,001.11 km) |
| Riom to Melres | 665.66 mi (1,071.27 km) |
| Riom to Mira | 705.09 mi (1,134.74 km) |
| Riom to Miranda do Corvo | 702.31 mi (1,130.26 km) |
| Riom to Mirandela | 597.04 mi (960.84 km) |
| Riom to Mogadouro | 583.34 mi (938.80 km) |
| Riom to Moimenta da Beira | 635.46 mi (1,022.68 km) |
| Riom to Moita | 794.04 mi (1,277.89 km) |
| Riom to Moncao | 633.10 mi (1,018.87 km) |
| Riom to Montalegre | 611.00 mi (983.31 km) |
