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"Wetland" . The United Nations (UN) RAMSAR Convention (Iran, 1971) on Wetlands of International Importance defines wetlands as "expanses of marshes, swamps, peatlands or water-covered surfaces, whether natural or artificial, permanent or temporary, stationary or flowing, fresh, brackish or salty, including expanses of seawater the depth of which at low tide does not exceed six metres".
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