| Groslay to Marco de Canavezes | 742.16 mi (1,194.39 km) |
| Groslay to Marinha Grande | 845.27 mi (1,360.33 km) |
| Groslay to Massama | 911.38 mi (1,466.73 km) |
| Groslay to Matosinhos | 760.74 mi (1,224.30 km) |
| Groslay to Mealhada | 795.01 mi (1,279.45 km) |
| Groslay to Melgaco | 698.00 mi (1,123.33 km) |
| Groslay to Melres | 756.69 mi (1,217.78 km) |
| Groslay to Mira | 801.57 mi (1,290.00 km) |
| Groslay to Miranda do Corvo | 806.80 mi (1,298.42 km) |
| Groslay to Mirandela | 694.23 mi (1,117.26 km) |
| Groslay to Mogadouro | 687.85 mi (1,106.99 km) |
| Groslay to Moimenta da Beira | 735.56 mi (1,183.78 km) |
| Groslay to Moita | 908.42 mi (1,461.97 km) |
| Groslay to Moncao | 707.73 mi (1,138.98 km) |
| Groslay to Montalegre | 696.52 mi (1,120.95 km) |
