peat hag
PEET hag
An eroded bank or island of peat on moorland — a dark, crumbling cliff of compressed plant matter, undercut by water and wind. Peat hags are the ruins of ancient bogs, exposing thousands of years of accumulated vegetation in cross-section.
Etymology
English: peat + hag (from Old Norse hǫgg, a cut, a gap). A hag is a broken place.
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