The german city Dortmund is located in the federal state of North Rhine-Westphalia. Its population makes it to one of the 10th largest cities in Germany. In the Ruhr-Area Dortmund is the largest city by area and population. Dortmund Moreover Dortmund is known as the “green metropolis” of North Rhine-Westphalia. Nearly half the municipal territory consists of waterways, woodland, agriculture and green spaces with spacious parks. This contrasts with nearly a hundred years of extensive coal mining and steel milling within the city limits.