| Romanshorn to Mangualde | 973.13 mi (1,566.09 km) |
| Romanshorn to Marco de Canavezes | 967.48 mi (1,557.01 km) |
| Romanshorn to Marinha Grande | 1,057.88 mi (1,702.49 km) |
| Romanshorn to Massama | 1,114.46 mi (1,793.55 km) |
| Romanshorn to Matosinhos | 991.55 mi (1,595.74 km) |
| Romanshorn to Mealhada | 1,011.49 mi (1,627.84 km) |
| Romanshorn to Melgaco | 939.11 mi (1,511.35 km) |
| Romanshorn to Melres | 982.78 mi (1,581.63 km) |
| Romanshorn to Mira | 1,021.71 mi (1,644.28 km) |
| Romanshorn to Miranda do Corvo | 1,017.94 mi (1,638.21 km) |
| Romanshorn to Mirandela | 913.98 mi (1,470.90 km) |
| Romanshorn to Mogadouro | 899.66 mi (1,447.87 km) |
| Romanshorn to Moimenta da Beira | 951.99 mi (1,532.09 km) |
| Romanshorn to Moita | 1,107.00 mi (1,781.54 km) |
| Romanshorn to Moncao | 950.10 mi (1,529.04 km) |
