| Middle River to Miranda de Ebro | 3,713.63 mi (5,976.51 km) |
| Middle River to Mislata | 3,925.46 mi (6,317.42 km) |
| Middle River to Moana | 3,449.08 mi (5,550.76 km) |
| Middle River to Moguer | 3,677.87 mi (5,918.96 km) |
| Middle River to Molina de Segura | 3,930.86 mi (6,326.10 km) |
| Middle River to Molins de Rey | 3,980.93 mi (6,406.69 km) |
| Middle River to Mollerusa | 3,922.25 mi (6,312.25 km) |
| Middle River to Mollet | 3,986.27 mi (6,415.27 km) |
| Middle River to Moncada | 3,986.70 mi (6,415.98 km) |
| Middle River to Moncada | 3,924.26 mi (6,315.49 km) |
| Middle River to Monforte de Lemos | 3,502.11 mi (5,636.10 km) |
| Middle River to Monforte del Cid | 3,944.15 mi (6,347.50 km) |
| Middle River to Mongat | 3,991.54 mi (6,423.77 km) |
| Middle River to Monovar | 3,937.14 mi (6,336.22 km) |
| Middle River to Monserrat | 3,920.08 mi (6,308.76 km) |
