| River Falls to Mangualde | 4,112.30 mi (6,618.10 km) |
| River Falls to Marco de Canavezes | 4,072.79 mi (6,554.53 km) |
| River Falls to Marinha Grande | 4,095.42 mi (6,590.95 km) |
| River Falls to Massama | 4,119.97 mi (6,630.46 km) |
| River Falls to Matosinhos | 4,049.21 mi (6,516.57 km) |
| River Falls to Mealhada | 4,091.35 mi (6,584.39 km) |
| River Falls to Melgaco | 4,031.47 mi (6,488.03 km) |
| River Falls to Melres | 4,066.64 mi (6,544.63 km) |
| River Falls to Mira | 4,077.14 mi (6,561.52 km) |
| River Falls to Miranda do Corvo | 4,107.60 mi (6,610.55 km) |
| River Falls to Mirandela | 4,102.23 mi (6,601.90 km) |
| River Falls to Mogadouro | 4,128.00 mi (6,643.37 km) |
| River Falls to Moimenta da Beira | 4,103.77 mi (6,604.38 km) |
| River Falls to Moita | 4,137.06 mi (6,657.95 km) |
| River Falls to Moncao | 4,024.08 mi (6,476.14 km) |
