Ridges of sand (5)

I believe the answer is:

dunes

'ridges of sand' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for dunes that I've seen before include "Hills of windblown sand" , "Sand hills by the sea" , "Nudes behind sand-hills" , "Ridges of sand" , "beach" .)

I've seen this clue in the Evening Standard and The Guardian.

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