| Sluis to Marco de Canavezes | 888.44 mi (1,429.81 km) |
| Sluis to Marinha Grande | 993.81 mi (1,599.39 km) |
| Sluis to Massama | 1,061.77 mi (1,708.75 km) |
| Sluis to Matosinhos | 904.74 mi (1,456.03 km) |
| Sluis to Mealhada | 943.18 mi (1,517.91 km) |
| Sluis to Melgaco | 839.44 mi (1,350.94 km) |
| Sluis to Melres | 902.43 mi (1,452.32 km) |
| Sluis to Mira | 948.47 mi (1,526.41 km) |
| Sluis to Miranda do Corvo | 956.39 mi (1,539.16 km) |
| Sluis to Mirandela | 843.30 mi (1,357.16 km) |
| Sluis to Mogadouro | 839.38 mi (1,350.86 km) |
| Sluis to Moimenta da Beira | 884.82 mi (1,423.99 km) |
| Sluis to Moita | 1,060.06 mi (1,706.01 km) |
| Sluis to Moncao | 848.42 mi (1,365.39 km) |
| Sluis to Montalegre | 841.53 mi (1,354.31 km) |
