| Spanish Lake to Mangualde | 4,211.56 mi (6,777.86 km) |
| Spanish Lake to Marco de Canavezes | 4,175.00 mi (6,719.01 km) |
| Spanish Lake to Marinha Grande | 4,184.40 mi (6,734.15 km) |
| Spanish Lake to Massama | 4,200.44 mi (6,759.96 km) |
| Spanish Lake to Matosinhos | 4,149.59 mi (6,678.11 km) |
| Spanish Lake to Mealhada | 4,186.66 mi (6,737.77 km) |
| Spanish Lake to Melgaco | 4,140.20 mi (6,663.01 km) |
| Spanish Lake to Melres | 4,167.15 mi (6,706.39 km) |
| Spanish Lake to Mira | 4,171.85 mi (6,713.94 km) |
| Spanish Lake to Miranda do Corvo | 4,201.23 mi (6,761.22 km) |
| Spanish Lake to Mirandela | 4,209.87 mi (6,775.14 km) |
| Spanish Lake to Mogadouro | 4,236.08 mi (6,817.32 km) |
| Spanish Lake to Moimenta da Beira | 4,206.28 mi (6,769.35 km) |
| Spanish Lake to Moita | 4,217.78 mi (6,787.86 km) |
| Spanish Lake to Moncao | 4,131.80 mi (6,649.49 km) |
