Hmmm... I tried "Ruhr", "The Ruhr", "Ruhr-Rhein", "Ruhr-Rhine", "The Ruhr-Rhein", "The Ruhr-Rhine", "Rheinland" etc, "Cologne", "Cologne-Dusseldorf", then Dortmund, Duisburg, Essen. It's good to include this as an option to guess, rather than it being greyed out and an answer already provided (like it so often is on other quizzes). But you should allow more answers for that one. I just gave up and let the time run out to find the specific answer
Shameful.
2/5 stars