World Sea Ports
| Port Name | Port Code | Country Name |
|---|---|---|
| Maidens | GBMAI | United Kingdom |
| Mailly-le-Château | FRM89 | France |
| Main Brook | CAMBR | Canada |
| Maintirano | MGMXT | Madagascar |
| Mainz | DEMAI | Germany |
| Mainzlar | DEGYM | Germany |
| Maiori | ITIOI | Italy |
| Maisières | BEMSR | Belgium |
| Maitresse Island | GBMSD | United Kingdom |
| Maitum/Dadiangas | PHMAI | Philippines (the) |