| Viersen to Montemor-o-Novo | 1,122.33 mi (1,806.21 km) |
| Viersen to Montemor-o-Velho | 1,052.61 mi (1,694.01 km) |
| Viersen to Montijo | 1,141.55 mi (1,837.14 km) |
| Viersen to Mortagua | 1,023.46 mi (1,647.11 km) |
| Viersen to Moura | 1,129.41 mi (1,817.61 km) |
| Viersen to Murtosa | 1,020.50 mi (1,642.33 km) |
| Viersen to Nazare | 1,095.98 mi (1,763.82 km) |
| Viersen to Nelas | 1,006.52 mi (1,619.85 km) |
| Viersen to Obidos | 1,112.21 mi (1,789.93 km) |
| Viersen to Odemira | 1,196.21 mi (1,925.11 km) |
| Viersen to Odivelas | 1,144.37 mi (1,841.69 km) |
| Viersen to Oeiras | 1,154.70 mi (1,858.31 km) |
| Viersen to Olhao | 1,205.82 mi (1,940.59 km) |
| Viersen to Oliveira de Azemeis | 1,009.54 mi (1,624.70 km) |
| Viersen to Oliveira de Frades | 1,006.50 mi (1,619.81 km) |
