Auckland City, New Zealand. The mainland part of Auckland City lies on an isthmus. The Waitemata Harbour, which opens to the Hauraki Gulf, separates the isthmus from North Shore City and north. The Manukau Harbour, which opens to the Tasman Sea, separates the isthmus from Manukau City and the south. 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 are part of Auckland City. The islands of the inner gulf include Rangitoto, Motutapu, Browns Island, Motuihe, Rakino, Ponui and Waiheke, while the outer gulf islands include Little Barrier, Great Barrier and the Mokohinau Islands.
A significant portion of Auckland's CBD and of the Auckland waterfront is built on land reclaimed over the last 100 years. Substantial development of such under-utilised areas to the west of the CBD has been projected, with large businesses beginning.
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