| Watford to Miranda de Ebro | 631.14 mi (1,015.72 km) |
| Watford to Mislata | 841.56 mi (1,354.36 km) |
| Watford to Moana | 756.80 mi (1,217.96 km) |
| Watford to Moguer | 1,042.12 mi (1,677.13 km) |
| Watford to Molina de Segura | 940.52 mi (1,513.62 km) |
| Watford to Molins de Rey | 716.71 mi (1,153.43 km) |
| Watford to Mollerusa | 695.22 mi (1,118.85 km) |
| Watford to Mollet | 709.93 mi (1,142.51 km) |
| Watford to Moncada | 713.08 mi (1,147.59 km) |
| Watford to Moncada | 836.68 mi (1,346.50 km) |
| Watford to Monforte de Lemos | 713.97 mi (1,149.03 km) |
| Watford to Monforte del Cid | 917.41 mi (1,476.43 km) |
| Watford to Mongat | 715.19 mi (1,150.99 km) |
| Watford to Monovar | 913.53 mi (1,470.19 km) |
| Watford to Monserrat | 849.73 mi (1,367.51 km) |
