| Altena to Marco de Canavezes | 1,025.48 mi (1,650.35 km) |
| Altena to Marinha Grande | 1,127.49 mi (1,814.51 km) |
| Altena to Massama | 1,192.48 mi (1,919.11 km) |
| Altena to Matosinhos | 1,044.66 mi (1,681.21 km) |
| Altena to Mealhada | 1,077.52 mi (1,734.10 km) |
| Altena to Melgaco | 982.43 mi (1,581.06 km) |
| Altena to Melres | 1,040.16 mi (1,673.97 km) |
| Altena to Mira | 1,084.56 mi (1,745.44 km) |
| Altena to Miranda do Corvo | 1,088.61 mi (1,751.96 km) |
| Altena to Mirandela | 976.63 mi (1,571.73 km) |
| Altena to Mogadouro | 968.99 mi (1,559.44 km) |
| Altena to Moimenta da Beira | 1,017.74 mi (1,637.90 km) |
| Altena to Moita | 1,188.74 mi (1,913.10 km) |
| Altena to Moncao | 992.22 mi (1,596.83 km) |
| Altena to Montalegre | 980.30 mi (1,577.64 km) |
