Hi
There is a wiki entry for 'landcover=dune'.
https://wiki.openstreetmap.org/wiki/Proposed_features/landcover#Landcover_tags_and_related_tags
It has 0 uses in the data base.
There is an existing tag 'natural=dune'.
https://wiki.openstreetmap.org/wiki/Tag:natural%3Ddune
To me dune is a land form.
From the Oxford Dictionary "A mound or ridge of sand or other loose
sediment formed by the wind, especially on the sea coast or in a desert."
So it is a mound or ridge ...ie a land form like a hill or a valley.
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