Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Westphalia is a region in Germany, centred on the cities of Arnsberg, Bielefeld, Bochum, Detmold, Dortmund, Gelsenkirchen, Hagen, Minden and Münster and included in the state of North Rhine-Westphalia. Westphalia is roughly the region between the rivers Rhine and Weser, located north and south 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 (6,200 and 8,500 sq mi) in land area, and between 4.3 million and 8 million inhabitants. There is, however, a general consensus that Münster as well as Bielefeld and Dortmund are part of Westphalia.