Fen

Fen
A type of wetland that accumulates peat deposits. Fens are less acidic than bogs, deriving most of their water from groundwater rich in calcium and magnesium. (See wetlands.)
Source: Terms of the Environment ...

fen
a type of wetland that accumulates peat deposits, but not as much as a bog. Fens are less acidic than bogs, deriving most of their water from groundwater rich in calcium and magnesium.
fermentation, anaerobic ...

M mire, bog and fen habitats
Definition (english only)
One of the main habitat types in the EUNIS habitats classification.

A wetland such as a fen or bog that accumulates peat and whose vegetation is dominated by sphagnum moss and small herbs.
Percolation ...

See also: Water, Groundwater, Table, Waste, Wetland