| River Ridge to Mangualde | 4,540.20 mi (7,306.75 km) |
| River Ridge to Marco de Canavezes | 4,507.79 mi (7,254.59 km) |
| River Ridge to Marinha Grande | 4,501.48 mi (7,244.43 km) |
| River Ridge to Massama | 4,507.08 mi (7,253.45 km) |
| River Ridge to Matosinhos | 4,480.74 mi (7,211.05 km) |
| River Ridge to Mealhada | 4,511.14 mi (7,259.97 km) |
| River Ridge to Melgaco | 4,481.24 mi (7,211.85 km) |
| River Ridge to Melres | 4,498.12 mi (7,239.03 km) |
| River Ridge to Mira | 4,495.93 mi (7,235.49 km) |
| River Ridge to Miranda do Corvo | 4,523.44 mi (7,279.77 km) |
| River Ridge to Mirandela | 4,548.31 mi (7,319.79 km) |
| River Ridge to Mogadouro | 4,574.53 mi (7,361.99 km) |
| River Ridge to Moimenta da Beira | 4,538.80 mi (7,304.50 km) |
| River Ridge to Moita | 4,524.37 mi (7,281.26 km) |
| River Ridge to Moncao | 4,471.83 mi (7,196.71 km) |
