| Chepstow to Mangualde | 800.09 mi (1,287.62 km) |
| Chepstow to Marco de Canavezes | 767.70 mi (1,235.50 km) |
| Chepstow to Marinha Grande | 874.60 mi (1,407.54 km) |
| Chepstow to Massama | 945.53 mi (1,521.68 km) |
| Chepstow to Matosinhos | 776.88 mi (1,250.26 km) |
| Chepstow to Mealhada | 825.13 mi (1,327.92 km) |
| Chepstow to Melgaco | 708.62 mi (1,140.41 km) |
| Chepstow to Melres | 779.42 mi (1,254.35 km) |
| Chepstow to Mira | 826.45 mi (1,330.04 km) |
| Chepstow to Miranda do Corvo | 842.01 mi (1,355.08 km) |
| Chepstow to Mirandela | 733.33 mi (1,180.17 km) |
| Chepstow to Mogadouro | 737.46 mi (1,186.82 km) |
| Chepstow to Moimenta da Beira | 773.02 mi (1,244.06 km) |
| Chepstow to Moita | 947.95 mi (1,525.58 km) |
| Chepstow to Moncao | 715.20 mi (1,151.00 km) |
