| W | 411 | Inland marshes | |
| 412 | Peat bogs | ||
| 421 | Salt marshes | ||
| 422 | Salines | ||
| 423 | Intertidal flats | ||
| 511 | Water courses | ||
| 512 | Water bodies | ||
| 521 | Coastal lagoons | ||
| 522 | Estuaries |