| Great Baddow to Mangualde | 862.60 mi (1,388.23 km) |
| Great Baddow to Marco de Canavezes | 835.16 mi (1,344.06 km) |
| Great Baddow to Marinha Grande | 942.22 mi (1,516.36 km) |
| Great Baddow to Massama | 1,012.12 mi (1,628.86 km) |
| Great Baddow to Matosinhos | 848.20 mi (1,365.04 km) |
| Great Baddow to Mealhada | 891.72 mi (1,435.08 km) |
| Great Baddow to Melgaco | 780.81 mi (1,256.59 km) |
| Great Baddow to Melres | 848.19 mi (1,365.04 km) |
| Great Baddow to Mira | 895.14 mi (1,440.59 km) |
| Great Baddow to Miranda do Corvo | 906.81 mi (1,459.38 km) |
| Great Baddow to Mirandela | 794.69 mi (1,278.93 km) |
| Great Baddow to Mogadouro | 794.58 mi (1,278.76 km) |
| Great Baddow to Moimenta da Beira | 835.80 mi (1,345.08 km) |
| Great Baddow to Moita | 1,012.41 mi (1,629.32 km) |
| Great Baddow to Moncao | 788.74 mi (1,269.36 km) |
