North Rhine-Westphalia (German: Nordrhein-Westfalen[ˈnɔɐ̯(ʀ)tʁaɪn vɛstˈfaːlən] ( listen)) is the most populous state of Germany. North Rhine-Westphalia was formed in 1946 as a merger of the northern Rhineland and Westphalia, both formerly parts of Prussia. Its capital is Düsseldorf; the biggest city is Cologne. Four of Germany's ten biggest cities, Cologne, Düsseldorf, Dortmund, and Essen, are located in North Rhine-Westphalia. The state is currently run by a coalition of the Social Democrats (SPD) and Greens.
Bielefeld (pron.: /ˈbiːləfɛlt/; German pronunciation: [ˈbiːləfɛlt]) is a city in the Ostwestfalen-Lippe Region in the north-east of North-Rhine Westphalia, Germany. With a population of 323,000, it is also the most populous city in the RegierungsbezirkDetmold. Its current mayor is Pit Clausen.
The historical centre of the city is situated north of the Teutoburg Forest line of hills, but modern Bielefeld also incorporates boroughs on the opposite side and on the hills.