| River Falls to Montalegre | 4,063.06 mi (6,538.86 km) |
| River Falls to Montemor-o-Novo | 4,170.69 mi (6,712.08 km) |
| River Falls to Montemor-o-Velho | 4,089.81 mi (6,581.91 km) |
| River Falls to Montijo | 4,139.38 mi (6,661.70 km) |
| River Falls to Mortagua | 4,098.73 mi (6,596.27 km) |
| River Falls to Moura | 4,225.27 mi (6,799.91 km) |
| River Falls to Murtosa | 4,069.67 mi (6,549.50 km) |
| River Falls to Nazare | 4,095.55 mi (6,591.15 km) |
| River Falls to Nelas | 4,111.94 mi (6,617.53 km) |
| River Falls to Obidos | 4,101.16 mi (6,600.18 km) |
| River Falls to Odemira | 4,195.58 mi (6,752.14 km) |
| River Falls to Odivelas | 4,122.81 mi (6,635.03 km) |
| River Falls to Oeiras | 4,121.07 mi (6,632.21 km) |
| River Falls to Olhao | 4,253.48 mi (6,845.31 km) |
| River Falls to Oliveira de Azemeis | 4,072.30 mi (6,553.74 km) |
