German Industrial City is a term that refers to the city of Essen and the Ruhr region in Germany. Essen is a city located in the Ruhr region, which is an area known for its industrial production. The city of Essen is the ninth largest city in Germany and is home to many large companies, such as ThyssenKrupp and RWE. The Ruhr region is one of the most densely populated areas in Europe and is home to many of Germany's largest cities, including Dortmund, Duisburg, and Bochum.