| Gourock to Montalegre | 985.41 mi (1,585.86 km) |
| Gourock to Montemor-o-Novo | 1,205.77 mi (1,940.51 km) |
| Gourock to Montemor-o-Velho | 1,104.86 mi (1,778.10 km) |
| Gourock to Montijo | 1,207.98 mi (1,944.05 km) |
| Gourock to Mortagua | 1,083.51 mi (1,743.74 km) |
| Gourock to Moura | 1,237.28 mi (1,991.20 km) |
| Gourock to Murtosa | 1,065.73 mi (1,715.12 km) |
| Gourock to Nazare | 1,146.49 mi (1,845.10 km) |
| Gourock to Nelas | 1,075.43 mi (1,730.74 km) |
| Gourock to Obidos | 1,163.74 mi (1,872.85 km) |
| Gourock to Odemira | 1,281.58 mi (2,062.50 km) |
| Gourock to Odivelas | 1,202.73 mi (1,935.60 km) |
| Gourock to Oeiras | 1,211.11 mi (1,949.09 km) |
| Gourock to Olhao | 1,315.36 mi (2,116.86 km) |
| Gourock to Oliveira de Azemeis | 1,057.28 mi (1,701.53 km) |
