| River Forest to Mangualde | 3,996.88 mi (6,432.36 km) |
| River Forest to Marco de Canavezes | 3,959.39 mi (6,372.02 km) |
| River Forest to Marinha Grande | 3,972.80 mi (6,393.60 km) |
| River Forest to Massama | 3,991.53 mi (6,423.75 km) |
| River Forest to Matosinhos | 3,934.47 mi (6,331.92 km) |
| River Forest to Mealhada | 3,973.12 mi (6,394.12 km) |
| River Forest to Melgaco | 3,922.64 mi (6,312.87 km) |
| River Forest to Melres | 3,952.03 mi (6,360.18 km) |
| River Forest to Mira | 3,958.47 mi (6,370.54 km) |
| River Forest to Miranda do Corvo | 3,988.23 mi (6,418.43 km) |
| River Forest to Mirandela | 3,992.73 mi (6,425.68 km) |
| River Forest to Mogadouro | 4,018.85 mi (6,467.72 km) |
| River Forest to Moimenta da Beira | 3,990.62 mi (6,422.29 km) |
| River Forest to Moita | 4,008.82 mi (6,451.57 km) |
| River Forest to Moncao | 3,914.51 mi (6,299.80 km) |
