German industrial region (4)

I believe the answer is:

ruhr

'german industrial region' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for ruhr that I've seen before include "Herman industrial area" , "German industrial region" , "German river flowing into the Rhine" , "Traditional region of German heavy industry" , "Dortmund area?" .)

I've seen this clue in the Newsday, The New York Times, The Times and The Independent.

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