Low-lying marshy or boggy land, especially the fens of eastern England; wet, muddy terrain with characteristic vegetation.
Old English 'fenn' (marsh) plus 'land'; describes the specific geography of regions like the English Fenlands, an ancient wetland ecosystem.
The English Fenlands are slowly sinking into the sea as ancient peat decomposes—it's like the ground is literally shrinking underneath your feet, and the wetlands that have existed for thousands of years are vanishing!
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