| Harwich to Mangualde | 892.13 mi (1,435.74 km) |
| Harwich to Marco de Canavezes | 865.49 mi (1,392.88 km) |
| Harwich to Marinha Grande | 972.40 mi (1,564.92 km) |
| Harwich to Massama | 1,042.04 mi (1,677.00 km) |
| Harwich to Matosinhos | 879.08 mi (1,414.74 km) |
| Harwich to Mealhada | 921.82 mi (1,483.53 km) |
| Harwich to Melgaco | 811.94 mi (1,306.68 km) |
| Harwich to Melres | 878.70 mi (1,414.13 km) |
| Harwich to Mira | 925.55 mi (1,489.53 km) |
| Harwich to Miranda do Corvo | 936.61 mi (1,507.33 km) |
| Harwich to Mirandela | 824.18 mi (1,326.39 km) |
| Harwich to Mogadouro | 823.40 mi (1,325.13 km) |
| Harwich to Moimenta da Beira | 865.41 mi (1,392.75 km) |
| Harwich to Moita | 1,041.99 mi (1,676.92 km) |
| Harwich to Moncao | 820.04 mi (1,319.73 km) |
