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Overview in maps of geography, cities, economy and infrastructure. The Ruhr area is a highly urbanized region in North Rhine-Westphalia and, with around 5.1 million inhabitants, can be considered the largest metropolitan area in Germany. The Ruhr Regional Association has an area of around 4,400 square kilometers and is therefore almost five times the size of the federal state of Berlin. This includes four districts and eleven independent cities, the largest of which are Duisburg, Essen, Bochum and Dortmund. ☕️ https://ko-fi.com/dieweltinkarten