| Southwater to Mangualde | 802.51 mi (1,291.51 km) |
| Southwater to Marco de Canavezes | 774.76 mi (1,246.85 km) |
| Southwater to Marinha Grande | 881.86 mi (1,419.21 km) |
| Southwater to Massama | 951.85 mi (1,531.85 km) |
| Southwater to Matosinhos | 787.64 mi (1,267.59 km) |
| Southwater to Mealhada | 831.39 mi (1,337.99 km) |
| Southwater to Melgaco | 720.21 mi (1,159.06 km) |
| Southwater to Melres | 787.74 mi (1,267.74 km) |
| Southwater to Mira | 834.70 mi (1,343.33 km) |
| Southwater to Miranda do Corvo | 846.60 mi (1,362.46 km) |
| Southwater to Mirandela | 734.62 mi (1,182.26 km) |
| Southwater to Mogadouro | 734.85 mi (1,182.62 km) |
| Southwater to Moimenta da Beira | 775.66 mi (1,248.31 km) |
| Southwater to Moita | 952.27 mi (1,532.53 km) |
| Southwater to Moncao | 728.11 mi (1,171.78 km) |
