| Nailsea to Mangualde | 785.06 mi (1,263.44 km) |
| Nailsea to Marco de Canavezes | 752.75 mi (1,211.44 km) |
| Nailsea to Marinha Grande | 859.67 mi (1,383.51 km) |
| Nailsea to Massama | 930.59 mi (1,497.64 km) |
| Nailsea to Matosinhos | 762.01 mi (1,226.33 km) |
| Nailsea to Mealhada | 810.17 mi (1,303.85 km) |
| Nailsea to Melgaco | 693.75 mi (1,116.49 km) |
| Nailsea to Melres | 764.49 mi (1,230.33 km) |
| Nailsea to Mira | 811.53 mi (1,306.04 km) |
| Nailsea to Miranda do Corvo | 827.02 mi (1,330.97 km) |
| Nailsea to Mirandela | 718.28 mi (1,155.96 km) |
| Nailsea to Mogadouro | 722.38 mi (1,162.55 km) |
| Nailsea to Moimenta da Beira | 758.00 mi (1,219.88 km) |
| Nailsea to Moita | 932.97 mi (1,501.48 km) |
| Nailsea to Moncao | 700.37 mi (1,127.14 km) |
