mokradła v angličtině:

Forested wetlands are the subject of extensive USDA research.

They got through the marsh.

They plan to build a complex drainage system to dry the marshes around the town

the marsh marigold loves damp fields, riverbanks, and marshes

Anna was killed in a marsh near her house.

... drainage of a tidal marsh.

In any case, this method is still widely used today, even though the water table has dropped considerably over the past two centuries as nearby marshes and swamps were drained.