Auckland City () was a territorial authority with city status covering the central isthmus of the urban area of Auckland, New Zealand. It was governed by the Auckland City Council from 1989 to 2010, and as a territory within the wider Auckland Region, was also governed by Auckland Regional Council. Auckland City was disestablished as a local authority on 1 November 2010, when Auckland City Council was amalgamated with other councils of the Auckland Region into the new Auckland Council. At the time of its disestablishment, the city had a resident population of around 450,000. The Auckland City included the Auckland CBD – a major financial and commercial centre – the surrounding suburbs, and Hauraki Gulf islands such as Waiheke and Great Barrier Island. Geography The mainland part of Auckland City occupied the Auckland isthmus, also known as the Tāmaki isthmus. The Waitematā Harbour, which opens to the Hauraki Gulf, separated North Shore City from the isthmus. The Manukau Harbour, which opens to the Tasman Sea, separated Manukau City from the isthmus. The distance between the two harbours is particularly narrow at each end of the isthmus. At the western end, the Whau River, an estuarial arm of the Waitematā Harbour, comes within two kilometres of the waters of the Manukau Harbour on the west coast and marks the beginning of the Northland Peninsula. A few kilometres to the southeast at Ōtāhuhu, the Tāmaki River, an arm of the Hauraki Gulf on the east coast, comes just 1200 metres from the Manukau's waters. Being part of the Auckland volcanic field, much of the isthmus is mantled with volcanic rocks and soils, and several prominent scoria cones dot the isthmus. Many Hauraki Gulf islands were part of Auckland City. Such islands of the inner gulf included Rangitoto, Motutapu, Browns Island, Motuihe, Rakino, Ponui and Waiheke, while the outer gulf islands included Little Barrier Island, Great Barrier and the Mokohinau Islands. Local government In November 1989, central government restructured local authorities throughout New Zealand. After substantial protests and legal challenges, Auckland City was merged with eight smaller local authorities to form a new Auckland City Council. The new Auckland City had double the population of the old. However, amalgamation, forced onto local authorities often against their will, was criticised to have led to less democracy and higher rates for the same services. A further restructuring and amalgamation brought all seven councils in