Department of France whose capital is Mezieres (8)

I believe the answer is:

ardennes

(Other definitions for ardennes that I've seen before include "Wooded area of France/Belgium" , "part of France" , "Wooded region of south-east Belgium, extending into Luxembourg, France and Germany" , "forest" , "Region of NE France" .)

I've seen this clue in The Independent.

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