. The city centre and northern neighbourhoods are on Byfjorden, 'the city fjord', and the city is surrounded by mountains; Bergen is known as the 'city of seven mountains'. Many of the extra-municipal suburbs are on islands. Bergen is the administrative centre of Hordaland and consists of eight boroughs—Arna, Bergenhus, Fana, Fyllingsdalen, Laksevåg, Ytrebygda, Årstad and Åsane.