| Arecibo to Mangualde | 3,782.90 mi (6,087.99 km) |
| Arecibo to Marco de Canavezes | 3,766.75 mi (6,062.00 km) |
| Arecibo to Marinha Grande | 3,715.57 mi (5,979.64 km) |
| Arecibo to Massama | 3,690.88 mi (5,939.90 km) |
| Arecibo to Matosinhos | 3,738.32 mi (6,016.25 km) |
| Arecibo to Mealhada | 3,745.38 mi (6,027.60 km) |
| Arecibo to Melgaco | 3,768.10 mi (6,064.17 km) |
| Arecibo to Melres | 3,752.94 mi (6,039.78 km) |
| Arecibo to Mira | 3,730.91 mi (6,004.32 km) |
| Arecibo to Miranda do Corvo | 3,749.57 mi (6,034.35 km) |
| Arecibo to Mirandela | 3,818.87 mi (6,145.87 km) |
| Arecibo to Mogadouro | 3,841.86 mi (6,182.87 km) |
| Arecibo to Moimenta da Beira | 3,793.09 mi (6,104.39 km) |
| Arecibo to Moita | 3,705.89 mi (5,964.05 km) |
| Arecibo to Moncao | 3,756.88 mi (6,046.11 km) |
