Westphalia is a region in Germany roughly between the rivers Rhine and Weser, located north of the Ruhr River. No exact definition of borders can be given, because the name "Westphalia" was applied to several different entities in history. For this reason specifications of area and population are greatly differing. They range between 16,000 and 22,000 km² in land area, and between 4.3 million and 8 million inhabitants. There is however consent that both Münster and Osnabrück as well as Bielefeld and Dortmund are part of Westphalia.