World Sea Ports
| Port Name | Port Code | Country Name |
|---|---|---|
| Symi | GRSYM | Greece |
| Syowa | AQSYW | Antarctica |
| Syracuse | USSYR | United States of America (the) |
| Syros (Syra) | GRJSY | Greece |
| Syvota | GRSYV | Greece |
| Syzran | RUSYZ | Russian Federation (the) |
| Szczecin | PLSZZ | Poland |
| Szeged | HUSZE | Hungary |
| Szentendre | HUSZD | Hungary |
| Szigetcsép | HUPES | Hungary |