How To Use Ruhr valley In A Sentence

• BMW conducted interviews and did market research in megacities, that is, urban areas with more than six million people, around the world - places like Los Angeles, Tokyo, London, Paris, Barcelona, New York and the Ruhr Valley area in Autoblog Green
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• A city of northwest Germany in the Ruhr Valley northwest of Essen. It developed as a coal-mining center after the 1860's. Population, 112,353.
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