Who has the development history of Ruhr area in Germany?

Ruhr is an urban agglomeration, located in the western German state of North Rhine-westfalen, with a population of 5.3 million and an area of 4,435 square kilometers. He is part of the Rhine-Ruhr urban agglomeration. The population of the whole urban agglomeration is more than 10 million, and the area is nearly 10 square kilometers. Today's Ruhr refers to Ruhr. After Bochum, Botrop, Dortmund, Duisburg, Essen, Gelsenkirchen, Hagen, Hamm, Hearn and Mullenheim. Oberhausen, die Kreise Recklinghausen, Unna, Wesel and Ennapu-Ruhr.

Ruhr area is not a unified natural area. Due to the complicated history, the development of Ruhr area is not like Berlin or Paris, which takes the core city as the center and expands the city scope to the periphery through rapid development, that is, it is different from the single-center immigrant area. On the contrary, the Ruhr area has grown independently during the German industrialization in the19th century. Ruhr District is committed to transforming industrial landscape into facilities such as leisure, entertainment, exhibition and education. And the restoration of the natural environment since the end of the industrial production task in the1960s. Red Dot, the world's four major industrial design awards, also set up a design center in Essen 12 customs union mining park, and 20 10 Ruhr district with Essen as the main part was selected in european capital of culture.