Pilsen (Czech: Plzeň, [ˈpl̩.zɛɲ]; German: Pilsen; Plzeň or Plzen are also used in English) is a city in western Bohemia in the Czech Republic. It is the capital of the Plzeň Region and the fourth most populous city in the Czech Republic. It is located about 90 km west of Prague at the confluence of four rivers (Radbuza, Mže, Úhlava, and Úslava) which form the Berounka River. Pilsen is also the seat of the Municipality with Extended Competence and Municipality with Commissioned Local Authority. The city is known world wide for the Pilsener beer.