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An area (including swamp, marsh, bog, prairie pothole, or similar area) having a predominance of hydric soils that are inundated or saturated by surface water or groundwater at a frequency and duration sufficient to support and that under normal circumstances supports the anaerobic condition that supports the growth and regeneration of hydrophytic vegetation.
Source
http://www.mnr.gov.on.ca/en/Business/Water/2ColumnSubPage/STEL02_163778.html