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Public-images-osm logo.svg landuse = peat_cutting
Peat cutting - geograph.org.uk - 1385530.jpg
An excavation created by the removal of peat Edit or translate this description.
Group: Landuse
Used on these elements
should not be used on nodesshould not be used on waysmay be used on areasshould not be used on relations
Status: in use

An excavation created by the removal of peat.

So it is from natural=wetland however, this tag would indicate that the area is designated as a "peat_cutting" area. .. So it is not "natural" as the area gets excavated layer by layer.