| Gretna to Montalegre | 4,504.64 mi (7,249.52 km) |
| Gretna to Montemor-o-Novo | 4,556.51 mi (7,332.99 km) |
| Gretna to Montemor-o-Velho | 4,497.94 mi (7,238.73 km) |
| Gretna to Montijo | 4,521.05 mi (7,275.93 km) |
| Gretna to Mortagua | 4,514.28 mi (7,265.03 km) |
| Gretna to Moura | 4,607.84 mi (7,415.60 km) |
| Gretna to Murtosa | 4,487.67 mi (7,222.21 km) |
| Gretna to Nazare | 4,491.58 mi (7,228.49 km) |
| Gretna to Nelas | 4,531.38 mi (7,292.56 km) |
| Gretna to Obidos | 4,492.48 mi (7,229.96 km) |
| Gretna to Odemira | 4,560.62 mi (7,339.60 km) |
| Gretna to Odivelas | 4,504.37 mi (7,249.09 km) |
| Gretna to Oeiras | 4,499.87 mi (7,241.85 km) |
| Gretna to Olhao | 4,614.91 mi (7,426.98 km) |
| Gretna to Oliveira de Azemeis | 4,493.11 mi (7,230.97 km) |
