| Somain to Marco de Canavezes | 837.88 mi (1,348.44 km) |
| Somain to Marinha Grande | 942.23 mi (1,516.37 km) |
| Somain to Massama | 1,009.28 mi (1,624.29 km) |
| Somain to Matosinhos | 855.33 mi (1,376.51 km) |
| Somain to Mealhada | 891.74 mi (1,435.12 km) |
| Somain to Melgaco | 791.16 mi (1,273.25 km) |
| Somain to Melres | 852.16 mi (1,371.42 km) |
| Somain to Mira | 897.67 mi (1,444.67 km) |
| Somain to Miranda do Corvo | 904.24 mi (1,455.23 km) |
| Somain to Mirandela | 791.30 mi (1,273.47 km) |
| Somain to Mogadouro | 786.11 mi (1,265.13 km) |
| Somain to Moimenta da Beira | 832.77 mi (1,340.21 km) |
| Somain to Moita | 1,006.92 mi (1,620.48 km) |
| Somain to Moncao | 800.51 mi (1,288.30 km) |
| Somain to Montalegre | 791.53 mi (1,273.85 km) |
