| Harwich to Mancha Real | 1,005.70 mi (1,618.51 km) |
| Harwich to Manilva | 1,120.82 mi (1,803.79 km) |
| Harwich to Manises | 864.17 mi (1,390.75 km) |
| Harwich to Manlleu | 688.03 mi (1,107.28 km) |
| Harwich to Manresa | 705.77 mi (1,135.83 km) |
| Harwich to Manzanares | 921.25 mi (1,482.61 km) |
| Harwich to Manzanares el Real | 811.51 mi (1,306.01 km) |
| Harwich to Maracena | 1,045.59 mi (1,682.71 km) |
| Harwich to Marbella | 1,106.90 mi (1,781.38 km) |
| Harwich to Marchena | 1,059.86 mi (1,705.67 km) |
| Harwich to Marin | 806.94 mi (1,298.65 km) |
| Harwich to Marratxi | 852.25 mi (1,371.57 km) |
| Harwich to Martorell | 723.37 mi (1,164.14 km) |
| Harwich to Martos | 1,014.57 mi (1,632.79 km) |
| Harwich to Masamagrell | 857.65 mi (1,380.26 km) |
