What is a Fen?

Fens are an important wetland type in the mountains of California. Fens are permanently saturated wetlands, receiving significant water and nutrients from a ground source of water. Ground water fed fens are widespread in the California mountains of the Sierra Nevada, coast range, and southern Cascades.

Fens in Ireland FactsheetIrish Peatland Conservation Council

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Calcareous Fens: Understanding this Rare, Special and Sensitive Wetland Type — Mitigation Partners, Inc (MPI)

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Fen - Wikipedia

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Grand River Fen Preserve The Nature Conservancy in MI