| Erba to Marco de Canavezes | 925.09 mi (1,488.78 km) |
| Erba to Marinha Grande | 1,008.31 mi (1,622.72 km) |
| Erba to Massama | 1,060.11 mi (1,706.09 km) |
| Erba to Matosinhos | 950.82 mi (1,530.20 km) |
| Erba to Mealhada | 964.47 mi (1,552.16 km) |
| Erba to Melgaco | 904.13 mi (1,455.05 km) |
| Erba to Melres | 940.32 mi (1,513.30 km) |
| Erba to Mira | 975.91 mi (1,570.57 km) |
| Erba to Miranda do Corvo | 968.67 mi (1,558.93 km) |
| Erba to Mirandela | 870.78 mi (1,401.38 km) |
| Erba to Mogadouro | 853.76 mi (1,374.00 km) |
| Erba to Moimenta da Beira | 906.43 mi (1,458.75 km) |
| Erba to Moita | 1,051.12 mi (1,691.61 km) |
| Erba to Moncao | 915.38 mi (1,473.17 km) |
| Erba to Montalegre | 889.63 mi (1,431.73 km) |
