| Shoreline to Montalegre | 5,072.27 mi (8,163.03 km) |
| Shoreline to Montemor-o-Novo | 5,227.28 mi (8,412.50 km) |
| Shoreline to Montemor-o-Velho | 5,130.60 mi (8,256.91 km) |
| Shoreline to Montijo | 5,202.08 mi (8,371.94 km) |
| Shoreline to Mortagua | 5,131.57 mi (8,258.47 km) |
| Shoreline to Moura | 5,281.17 mi (8,499.22 km) |
| Shoreline to Murtosa | 5,102.22 mi (8,211.22 km) |
| Shoreline to Nazare | 5,147.66 mi (8,284.36 km) |
| Shoreline to Nelas | 5,139.95 mi (8,271.95 km) |
| Shoreline to Obidos | 5,157.38 mi (8,300.00 km) |
| Shoreline to Odemira | 5,269.96 mi (8,481.19 km) |
| Shoreline to Odivelas | 5,186.76 mi (8,347.29 km) |
| Shoreline to Oeiras | 5,187.72 mi (8,348.83 km) |
| Shoreline to Olhao | 5,327.31 mi (8,573.47 km) |
| Shoreline to Oliveira de Azemeis | 5,101.86 mi (8,210.65 km) |
