| Groveton to Mangualde | 3,589.29 mi (5,776.41 km) |
| Groveton to Marco de Canavezes | 3,555.57 mi (5,722.14 km) |
| Groveton to Marinha Grande | 3,554.25 mi (5,720.01 km) |
| Groveton to Massama | 3,563.67 mi (5,735.17 km) |
| Groveton to Matosinhos | 3,528.94 mi (5,679.28 km) |
| Groveton to Mealhada | 3,561.46 mi (5,731.62 km) |
| Groveton to Melgaco | 3,526.70 mi (5,675.68 km) |
| Groveton to Melres | 3,546.42 mi (5,707.41 km) |
| Groveton to Mira | 3,546.34 mi (5,707.29 km) |
| Groveton to Miranda do Corvo | 3,574.53 mi (5,752.65 km) |
| Groveton to Mirandela | 3,594.59 mi (5,784.94 km) |
| Groveton to Mogadouro | 3,620.87 mi (5,827.22 km) |
| Groveton to Moimenta da Beira | 3,586.73 mi (5,772.28 km) |
| Groveton to Moita | 3,581.02 mi (5,763.09 km) |
| Groveton to Moncao | 3,517.53 mi (5,660.92 km) |
