World Sea Ports
| Port Name | Port Code | Country Name |
|---|---|---|
| Maryport | GBMRY | United Kingdom |
| Marystown | CAMTN | Canada |
| Masachapa | NIMAC | Nicaragua |
| Masaki | JPMAS | Japan |
| Masan | KRMAS | Korea, Republic of |
| Masao | PHMAS | Philippines (the) |
| Masbate | PHMBT | Philippines (the) |
| Mascaraque | ESMQU | Spain |
| Masfjorden | NOMSF | Norway |
| Mashike | JPMSK | Japan |