| Erba to Montemor-o-Novo | 1,016.96 mi (1,636.64 km) |
| Erba to Montemor-o-Velho | 982.48 mi (1,581.15 km) |
| Erba to Montijo | 1,046.11 mi (1,683.54 km) |
| Erba to Mortagua | 952.81 mi (1,533.40 km) |
| Erba to Moura | 1,004.32 mi (1,616.30 km) |
| Erba to Murtosa | 961.59 mi (1,547.53 km) |
| Erba to Nazare | 1,019.70 mi (1,641.05 km) |
| Erba to Nelas | 932.37 mi (1,500.51 km) |
| Erba to Obidos | 1,032.52 mi (1,661.68 km) |
| Erba to Odemira | 1,078.69 mi (1,735.99 km) |
| Erba to Odivelas | 1,054.56 mi (1,697.16 km) |
| Erba to Oeiras | 1,064.80 mi (1,713.63 km) |
| Erba to Olhao | 1,068.79 mi (1,720.05 km) |
| Erba to Oliveira de Azemeis | 950.85 mi (1,530.25 km) |
| Erba to Oliveira de Frades | 941.23 mi (1,514.76 km) |
