| Greenock to Montalegre | 985.47 mi (1,585.96 km) |
| Greenock to Montemor-o-Novo | 1,205.83 mi (1,940.60 km) |
| Greenock to Montemor-o-Velho | 1,104.98 mi (1,778.30 km) |
| Greenock to Montijo | 1,208.10 mi (1,944.24 km) |
| Greenock to Mortagua | 1,083.59 mi (1,743.87 km) |
| Greenock to Moura | 1,237.26 mi (1,991.17 km) |
| Greenock to Murtosa | 1,065.85 mi (1,715.33 km) |
| Greenock to Nazare | 1,146.64 mi (1,845.34 km) |
| Greenock to Nelas | 1,075.48 mi (1,730.81 km) |
| Greenock to Obidos | 1,163.89 mi (1,873.10 km) |
| Greenock to Odemira | 1,281.66 mi (2,062.63 km) |
| Greenock to Odivelas | 1,202.87 mi (1,935.84 km) |
| Greenock to Oeiras | 1,211.26 mi (1,949.34 km) |
| Greenock to Olhao | 1,315.36 mi (2,116.87 km) |
| Greenock to Oliveira de Azemeis | 1,057.40 mi (1,701.72 km) |
