| River Ridge to Montalegre | 4,510.88 mi (7,259.56 km) |
| River Ridge to Montemor-o-Novo | 4,563.25 mi (7,343.84 km) |
| River Ridge to Montemor-o-Velho | 4,504.47 mi (7,249.24 km) |
| River Ridge to Montijo | 4,527.82 mi (7,286.82 km) |
| River Ridge to Mortagua | 4,520.75 mi (7,275.45 km) |
| River Ridge to Moura | 4,614.62 mi (7,426.52 km) |
| River Ridge to Murtosa | 4,494.11 mi (7,232.57 km) |
| River Ridge to Nazare | 4,498.21 mi (7,239.17 km) |
| River Ridge to Nelas | 4,537.83 mi (7,302.93 km) |
| River Ridge to Obidos | 4,499.16 mi (7,240.69 km) |
| River Ridge to Odemira | 4,567.53 mi (7,350.73 km) |
| River Ridge to Odivelas | 4,511.13 mi (7,259.97 km) |
| River Ridge to Oeiras | 4,506.66 mi (7,252.76 km) |
| River Ridge to Olhao | 4,621.87 mi (7,438.18 km) |
| River Ridge to Oliveira de Azemeis | 4,499.53 mi (7,241.30 km) |
