noun
fen
FEN/fen/
A low wetland with peat and mineral-rich water.
Shallow water winds between clumps of sedge in the flat fen.

Etymology
Old English fenn covered both mud or mire and marshy ground. The modern meaning retains the landscape sense: low, waterlogged land supporting marsh vegetation.
In context
this is no man's land land that belongs to Britain at e tide to the Sea at the flow in the fen country near kingslin
More examples
- Mineral-rich groundwater feeds the fen throughout the year.
- The trail skirts a fen where peat lies beneath the sedges.
- Draining these fens would threaten the plants that grow there.
Forms
fen · fens
peat noun — Partly decayed plant material accumulated in wet ground.
Similar words
- bog
- Usually rain-fed and acidic, unlike a mineral-fed fen.
- marsh
- A grassy wetland that need not contain peat.
- wetland
- A broader term covering fens and other water-saturated habitats.