Auckland lies on and around an isthmus, less than two kilometres wide at its narrowest point, between Mangere Inlet and the Tamaki River. There are two harbours in the Auckland urban area surrounding this isthmus: Waitemata Harbour to the north, which opens east to the Hauraki Gulf, and Manukau Harbour to the south, which opens west to the Tasman Sea.
Bridges span parts of both harbours, notably the Auckland Harbour Bridge crossing the Waitemata Harbour west of the Auckland Central Business District (CBD). The Mangere Bridge and the Upper Harbour Bridge span the upper reaches of the Manukau and Waitemata Harbours, respectively. In earlier times, portage paths crossed the narrowest sections of the isthmus.
Several islands of the Hauraki Gulf are administered as part of Auckland City, though they are not officially part of the Auckland metropolitan area. Parts of Waiheke Island effectively function as Auckland suburbs, while various smaller islands near Auckland are mostly zoned 'recreational open space' or are nature sanctuaries.
Bridges span parts of both harbours, notably the Auckland Harbour Bridge crossing the Waitemata Harbour west of the Auckland Central Business District (CBD). The Mangere Bridge and the Upper Harbour Bridge span the upper reaches of the Manukau and Waitemata Harbours, respectively. In earlier times, portage paths crossed the narrowest sections of the isthmus.
Several islands of the Hauraki Gulf are administered as part of Auckland City, though they are not officially part of the Auckland metropolitan area. Parts of Waiheke Island effectively function as Auckland suburbs, while various smaller islands near Auckland are mostly zoned 'recreational open space' or are nature sanctuaries.
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