| Giessen to Montemor-o-Novo | 1,164.93 mi (1,874.77 km) |
| Giessen to Montemor-o-Velho | 1,102.90 mi (1,774.94 km) |
| Giessen to Montijo | 1,186.85 mi (1,910.04 km) |
| Giessen to Mortagua | 1,073.21 mi (1,727.16 km) |
| Giessen to Moura | 1,167.10 mi (1,878.27 km) |
| Giessen to Murtosa | 1,072.99 mi (1,726.81 km) |
| Giessen to Nazare | 1,145.38 mi (1,843.30 km) |
| Giessen to Nelas | 1,055.18 mi (1,698.14 km) |
| Giessen to Obidos | 1,160.99 mi (1,868.43 km) |
| Giessen to Odemira | 1,236.61 mi (1,990.14 km) |
| Giessen to Odivelas | 1,191.09 mi (1,916.87 km) |
| Giessen to Oeiras | 1,201.51 mi (1,933.64 km) |
| Giessen to Olhao | 1,241.31 mi (1,997.69 km) |
| Giessen to Oliveira de Azemeis | 1,061.92 mi (1,708.99 km) |
| Giessen to Oliveira de Frades | 1,057.28 mi (1,701.53 km) |
