| Arth to Mangualde | 923.72 mi (1,486.59 km) |
| Arth to Marco de Canavezes | 918.92 mi (1,478.85 km) |
| Arth to Marinha Grande | 1,008.28 mi (1,622.67 km) |
| Arth to Massama | 1,064.25 mi (1,712.74 km) |
| Arth to Matosinhos | 943.29 mi (1,518.07 km) |
| Arth to Mealhada | 962.23 mi (1,548.56 km) |
| Arth to Melgaco | 891.83 mi (1,435.27 km) |
| Arth to Melres | 934.22 mi (1,503.48 km) |
| Arth to Mira | 972.64 mi (1,565.32 km) |
| Arth to Miranda do Corvo | 968.35 mi (1,558.41 km) |
| Arth to Mirandela | 865.22 mi (1,392.44 km) |
| Arth to Mogadouro | 850.47 mi (1,368.69 km) |
| Arth to Moimenta da Beira | 902.90 mi (1,453.08 km) |
| Arth to Moita | 1,056.60 mi (1,700.43 km) |
| Arth to Moncao | 902.89 mi (1,453.06 km) |
