1. a low and marshy or frequently flooded area of land: "a native species of fens and damp meadows"
▪ the flat low-lying areas of eastern England, mainly in Lincolnshire, Cambridgeshire, and Norfolk, formerly marshland but largely drained for agriculture since the 17th century.
▪ wetland with alkaline, neutral, or only slightly acid peaty soil.
Word OriginOld Englishfen(n), of Germanic origin; related to Dutch veen and German Fenn.
