| Altena to Montemor-o-Novo | 1,164.00 mi (1,873.28 km) |
| Altena to Montemor-o-Velho | 1,096.89 mi (1,765.27 km) |
| Altena to Montijo | 1,184.19 mi (1,905.77 km) |
| Altena to Mortagua | 1,067.53 mi (1,718.02 km) |
| Altena to Moura | 1,169.31 mi (1,881.82 km) |
| Altena to Murtosa | 1,065.48 mi (1,714.72 km) |
| Altena to Nazare | 1,140.00 mi (1,834.65 km) |
| Altena to Nelas | 1,050.20 mi (1,690.14 km) |
| Altena to Obidos | 1,156.03 mi (1,860.45 km) |
| Altena to Odemira | 1,237.16 mi (1,991.02 km) |
| Altena to Odivelas | 1,187.51 mi (1,911.11 km) |
| Altena to Oeiras | 1,197.88 mi (1,927.80 km) |
| Altena to Olhao | 1,244.98 mi (2,003.60 km) |
| Altena to Oliveira de Azemeis | 1,054.47 mi (1,697.01 km) |
| Altena to Oliveira de Frades | 1,050.90 mi (1,691.26 km) |
