| Lake Norman of Catawba to Mangualde | 3,879.45 mi (6,243.37 km) |
| Lake Norman of Catawba to Marco de Canavezes | 3,846.62 mi (6,190.54 km) |
| Lake Norman of Catawba to Marinha Grande | 3,841.99 mi (6,183.08 km) |
| Lake Norman of Catawba to Massama | 3,849.05 mi (6,194.45 km) |
| Lake Norman of Catawba to Matosinhos | 3,819.69 mi (6,147.20 km) |
| Lake Norman of Catawba to Mealhada | 3,850.79 mi (6,197.25 km) |
| Lake Norman of Catawba to Melgaco | 3,819.42 mi (6,146.76 km) |
| Lake Norman of Catawba to Melres | 3,837.11 mi (6,175.23 km) |
| Lake Norman of Catawba to Mira | 3,835.61 mi (6,172.81 km) |
| Lake Norman of Catawba to Miranda do Corvo | 3,863.36 mi (6,217.47 km) |
| Lake Norman of Catawba to Mirandela | 3,886.71 mi (6,255.06 km) |
| Lake Norman of Catawba to Mogadouro | 3,912.96 mi (6,297.29 km) |
| Lake Norman of Catawba to Moimenta da Beira | 3,877.69 mi (6,240.53 km) |
| Lake Norman of Catawba to Moita | 3,866.37 mi (6,222.32 km) |
| Lake Norman of Catawba to Moncao | 3,810.07 mi (6,131.72 km) |
