| Crystal to Mangualde | 4,137.92 mi (6,659.33 km) |
| Crystal to Marco de Canavezes | 4,098.24 mi (6,595.47 km) |
| Crystal to Marinha Grande | 4,121.72 mi (6,633.27 km) |
| Crystal to Massama | 4,146.80 mi (6,673.63 km) |
| Crystal to Matosinhos | 4,074.79 mi (6,557.73 km) |
| Crystal to Mealhada | 4,117.24 mi (6,626.06 km) |
| Crystal to Melgaco | 4,056.50 mi (6,528.30 km) |
| Crystal to Melres | 4,092.20 mi (6,585.76 km) |
| Crystal to Mira | 4,103.07 mi (6,603.26 km) |
| Crystal to Miranda do Corvo | 4,133.59 mi (6,652.38 km) |
| Crystal to Mirandela | 4,127.29 mi (6,642.24 km) |
| Crystal to Mogadouro | 4,153.02 mi (6,683.63 km) |
| Crystal to Moimenta da Beira | 4,129.17 mi (6,645.26 km) |
| Crystal to Moita | 4,163.86 mi (6,701.09 km) |
| Crystal to Moncao | 4,049.18 mi (6,516.53 km) |
