| Giessen to Marco de Canavezes | 1,033.18 mi (1,662.74 km) |
| Giessen to Marinha Grande | 1,132.95 mi (1,823.31 km) |
| Giessen to Massama | 1,196.20 mi (1,925.09 km) |
| Giessen to Matosinhos | 1,053.66 mi (1,695.71 km) |
| Giessen to Mealhada | 1,083.58 mi (1,743.85 km) |
| Giessen to Melgaco | 993.38 mi (1,598.69 km) |
| Giessen to Melres | 1,048.10 mi (1,686.75 km) |
| Giessen to Mira | 1,091.44 mi (1,756.51 km) |
| Giessen to Miranda do Corvo | 1,093.60 mi (1,759.98 km) |
| Giessen to Mirandela | 982.85 mi (1,581.75 km) |
| Giessen to Mogadouro | 973.52 mi (1,566.73 km) |
| Giessen to Moimenta da Beira | 1,023.50 mi (1,647.16 km) |
| Giessen to Moita | 1,191.51 mi (1,917.55 km) |
| Giessen to Moncao | 1,003.53 mi (1,615.03 km) |
| Giessen to Montalegre | 989.14 mi (1,591.87 km) |
