| Penarth to Mangualde | 779.35 mi (1,254.25 km) |
| Penarth to Marco de Canavezes | 746.37 mi (1,201.16 km) |
| Penarth to Marinha Grande | 853.09 mi (1,372.92 km) |
| Penarth to Massama | 924.07 mi (1,487.14 km) |
| Penarth to Matosinhos | 755.03 mi (1,215.11 km) |
| Penarth to Mealhada | 803.82 mi (1,293.63 km) |
| Penarth to Melgaco | 686.77 mi (1,105.26 km) |
| Penarth to Melres | 757.89 mi (1,219.71 km) |
| Penarth to Mira | 804.87 mi (1,295.31 km) |
| Penarth to Miranda do Corvo | 820.91 mi (1,321.12 km) |
| Penarth to Mirandela | 712.87 mi (1,147.25 km) |
| Penarth to Mogadouro | 717.58 mi (1,154.83 km) |
| Penarth to Moimenta da Beira | 752.30 mi (1,210.71 km) |
| Penarth to Moita | 926.76 mi (1,491.48 km) |
| Penarth to Moncao | 693.17 mi (1,115.56 km) |
