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Wetland definitions
If you were wondering what the difference was between a bog, fen, marsh and swamp, here are some quick definitions that will help:
Bog
A bog is a peatland with the water table at or near the surface. The surface often rises above the surrounding terrain. Bogs are strongly acidic and extremely nutrient poor. The peat layer is usually greater than 40cm and they are usually covered with Sphagnum spp. (moss). Bogs may have tree growth or be open.