Broadly, any tract of land that is permanently, seasonally or periodically waterlogged or inundated for some or all of the year. More strictly, an area defined in the Ramsar convention as ‘marsh, fen, peatland or water, whether natural or artificial, permanent or temporary, with water that is static or flowing, fresh, brackish or salt, including areas of marine water the depth of which at low tide does not exceed 6m’.

This definition is abridged from A – Z of tree terms: A companion to British arboriculture.
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