| Arecibo to Montalegre | 3,790.00 mi (6,099.41 km) |
| Arecibo to Montemor-o-Novo | 3,747.12 mi (6,030.41 km) |
| Arecibo to Montemor-o-Velho | 3,731.63 mi (6,005.48 km) |
| Arecibo to Montijo | 3,710.56 mi (5,971.58 km) |
| Arecibo to Mortagua | 3,757.07 mi (6,046.42 km) |
| Arecibo to Moura | 3,786.08 mi (6,093.10 km) |
| Arecibo to Murtosa | 3,738.33 mi (6,016.27 km) |
| Arecibo to Nazare | 3,707.49 mi (5,966.63 km) |
| Arecibo to Nelas | 3,777.68 mi (6,079.59 km) |
| Arecibo to Obidos | 3,701.02 mi (5,956.22 km) |
| Arecibo to Odemira | 3,719.20 mi (5,985.47 km) |
| Arecibo to Odivelas | 3,696.19 mi (5,948.45 km) |
| Arecibo to Oeiras | 3,688.18 mi (5,935.55 km) |
| Arecibo to Olhao | 3,760.35 mi (6,051.70 km) |
| Arecibo to Oliveira de Azemeis | 3,747.36 mi (6,030.79 km) |
