| Sliven to Marco de Canavezes | 1,763.16 mi (2,837.53 km) |
| Sliven to Marinha Grande | 1,830.71 mi (2,946.25 km) |
| Sliven to Massama | 1,870.23 mi (3,009.84 km) |
| Sliven to Matosinhos | 1,790.78 mi (2,881.98 km) |
| Sliven to Mealhada | 1,793.31 mi (2,886.05 km) |
| Sliven to Melgaco | 1,753.37 mi (2,821.77 km) |
| Sliven to Melres | 1,777.82 mi (2,861.12 km) |
| Sliven to Mira | 1,806.60 mi (2,907.45 km) |
| Sliven to Miranda do Corvo | 1,793.11 mi (2,885.73 km) |
| Sliven to Mirandela | 1,709.29 mi (2,750.84 km) |
| Sliven to Mogadouro | 1,688.51 mi (2,717.39 km) |
| Sliven to Moimenta da Beira | 1,739.85 mi (2,800.02 km) |
| Sliven to Moita | 1,857.97 mi (2,990.11 km) |
| Sliven to Moncao | 1,764.70 mi (2,840.01 km) |
| Sliven to Montalegre | 1,734.30 mi (2,791.08 km) |
