| Mariehamn to Castelo Branco | 1,830.98 mi (2,946.68 km) |
| Mariehamn to Castro Daire | 1,779.28 mi (2,863.48 km) |
| Mariehamn to Celorico de Basto | 1,753.07 mi (2,821.29 km) |
| Mariehamn to Chamusca | 1,885.62 mi (3,034.61 km) |
| Mariehamn to Chaves | 1,717.47 mi (2,764.00 km) |
| Mariehamn to Cinfaes | 1,773.26 mi (2,853.79 km) |
| Mariehamn to Coimbra | 1,833.43 mi (2,950.62 km) |
| Mariehamn to Condeixa-a-Nova | 1,840.94 mi (2,962.71 km) |
| Mariehamn to Corroios | 1,947.63 mi (3,134.41 km) |
| Mariehamn to Coruche | 1,910.11 mi (3,074.03 km) |
| Mariehamn to Costa de Caparica | 1,948.21 mi (3,135.34 km) |
| Mariehamn to Covilha | 1,803.41 mi (2,902.31 km) |
| Mariehamn to Eiras | 1,831.47 mi (2,947.47 km) |
| Mariehamn to Elvas | 1,878.15 mi (3,022.59 km) |
| Mariehamn to Entroncamento | 1,878.39 mi (3,022.97 km) |
