Definition:
According to RAMSAR, wetlands are areas of 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 six metres. Aiming specifically at agricultural use, wetlands are also defined as areas that have free water at or on the surface for at least the major part of the growing season. The water is sufficiently shallow to allow the growth of a wetland crop or of natural vegetation rooted in the soil.
Source:
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Food and Agriculture Organization of the United Nations, AQUASTAT Web Site
First definition: The RAMSAR Convention on wetlands (Ramsar, Iran, 1971) Second definition: Brinkman, R. and Blokhuis, W.A. 1986. Classification of the soils. In: The wetlands and rice in Sub-Saharan Africa. Juo, A.S.R. and Love, J.A. (eds.). IITA, Nigeri