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Auckland isthmus

The Auckland isthmus, also known as the Tāmaki isthmus, is a narrow stretch of land on the North Island of New Zealand in the Auckland Region, and the location of the central suburbs of the city of Auckland and the central business district. The isthmus is located between two rias : the Waitematā Harbour to the north, which opens to the Hauraki Gulf / Tīkapa Moana and Pacific Ocean, and the Manukau Harbour to the south, which opens to the Tasman Sea. The isthmus is the most southern section of the Northland Peninsula.

Geological history
, an ecosystem that once covered much of the Auckland isthmus (pictured: lava rock forest remnant at Withiel Thomas Reserve, Newmarket) '' (cabbage trees / tī kōuka) formed in many of the unforested areas of the isthmus (pictured: Cabbage Tree Swamp in Sandringham, circa 1910) The isthmus is formed from sections of Early Miocene Waitemata Group marine sedimentary rock, with Quaternary volcanic rock from geologically recent volcanic eruptions and lava flows. Approximately 23 million years ago, tectonic forces between the Pacific Plate and Australian Plate pushed the Auckland isthmus and surrounding areas to depths of 2,000-3,000 metres under sea-level. This formed a wide sedimentary basin, sheltered by the large Waitākere Volcano to the west. The Waitemata Group sedimentary rocks were formed by eroding deposits from the Northland Peninsula, then an uplifted island. As sea levels rose, the river valley to the north, which was carved through the Miocene marine sediments of the Waitemata Group, drowned and became a tidal estuary, the Waitematā Harbour. A similar process occurred on the Manukau Harbour to the south. During the Last Glacial Maximum, the modern isthmus was dominated by podocarp-angiosperm forest such as kahikatea, Prumnopitys taxifolia (matai) and tree ferns such as Alsophila smithii (kātote). As the area warmed, much of the podocarp forest was displaced by Myrtaceae such as pōhutukawa and Ascarina lucida. Prior to human settlement, much of the isthmus was covered in broadleaf tree forests, predominantly Beilschmiedia tarairi (taraire) and Vitex lucens (pūriri) trees. A large section of the Auckland volcanic field is found on the Auckland isthmus, including some of the most prominent basaltic tuff and scoria volcanoes: Maungawhau / Mount Eden, Maungakiekie / One Tree Hill, Ōhinerau / Mount Hobson, Maungarei / Mount Wellington and Ōwairaka / Mount Albert. Most of these volcanoes have erupted in the last 30,000 years, however the oldest identified volcanoes on the isthmus include Albert Park Volcano and Glover Park, which are estimated to have erupted 145,000 and 161,000 years ago respectively). Volcanism has influenced the geography of the isthmus, creating unique forested areas and swamplands. Underneath much of the isthmus are lava caves formed from eruptions such as Maungawhau / Mount Eden (circa 28,000 years ago). The eruption of Maungarei / Mount Wellington (circa 10,000 years ago) The volcanic eruptions led to the creation of the Epsom rock forest / Almorah rock forest, an ecosystem unique to the isthmus formed of trees such as Meryta sinclairii (puka), Litsea calicaris (mangeao), Alectryon excelsus (tītoki), Melicytus ramiflorus (māhoe), Piper excelsum (kawakawa) and Pseudopanax lessonii (houpara) growing in a primarily in a rock and leaf humus environment, with minimal soil. The largest remaining area of native bush on the isthmus is the Kepa Bush Reserve at the edge of the Purewa Creek in southern Mission Bay, where kohekohe trees dominate the old growth sections of the reserve. The isthmus is a part of the Northland temperate kauri forests ecoregion, Locally, the isthmus together with surrounding lowland areas and the North Shore as far north as East Coast Bays form the Department of Conservation's Tāmaki Ecological District. The western side of the isthmus serves as a border between the Western Northland and Hauraki-Auckland bioregions for land snails. Due to the length of the Northland Peninsula, there are significant tidal differences between the two harbours that border the isthmus. After high tide reaches the Waitematā Harbour, it takes approximately 3.5 hours for high tide to reach the Manukau Harbour. ==Human context==
Human context
Māori history , one of the most populated locations on the isthmus during the Waiohua confederation of the 17th and 18th centuries was widely grown on the isthmus during the pre-European period, and stored in rua kūmara (storehouses) (pictured: storehouse pit remnants on Ōhinerau) The Auckland isthmus was an early location visited by many of the Māori migration canoes, including the Matahourua, Aotea, Mātaatua, Tainui, Tākitimu, Tokomaru, Te Wakatūwhenua and Moekākara waka. The area was called '''', meaning "Tāmaki desired by many", in reference to the desirability of its natural resources and geography. Tāmaki Māori found the isthmus to be an important strategic location, due to the fertile soils and rich resources from the two harbours that bound the isthmus. Portages, where waka could be moved across the isthmus at its most narrow points, were important features of the isthmus for Tāmaki Māori. The most important of these was Te Tō Waka, at the modern location of Portage Road, Ōtāhuhu south of Ōtāhuhu / Mount Richmond, Other major portages were Karetu, which was to the south of Mutukaroa / Hamlins Hill Regional Park, In addition to portages, trails across the isthmus were created, one of the most notable being Karangahape Road, connecting the central isthmus to Cornwallis / Karangahape in the southern Waitākere Ranges. Between the 13th and 18th centuries, much of the isthmus was deforested, After harvesting, crops would be stored in rua kūmara, a storehouse fitted over a dry pit that is often found on the volcanic cones of the isthmus. In the 17th century, chief Hua Kaiwaka consolidated tribes on the isthmus as a confederation called Waiohua, a union which lasted for three generations until the early 18th century. and Waiohua settlements were found at Maungarei, Onehunga, Remuera, Ōrākei, Kohimarama, Rarotonga / Mount Smart, Te Tatua-a-Riukiuta, Ōwairaka / Mount Albert, the Waihorotiu Valley (modern Auckland CBD), in addition to Māngere to the south of the isthmus. Almost all hills, headlands and mountains on the isthmus have some history of Māori occupancy. After Waiohua were defeated in a series of battles, some members of Te Taoū settled at Tāmaki Makaurau and intermarried with Waiohua, later becoming known as Ngāti Whātua Ōrākei. In late 1821 during the Musket Wars, a Ngāpuhi taua (war party) led by Hongi Hika attacked Mauināina pā and Mokoia village on the banks of the Tāmaki River (modern-day Panmure), causing a great number of deaths. This incident marked the beginning of a period of time when the isthmus was most deserted, when Tāmaki Māori sheltered in regions away from the threat of Te Tai Tokerau Māori raiders that continued on until the early 1830s. The shoreline of the Waitematā Harbour was populated with pōhutukawa trees, however during the 1840s onwards most mature specimens were cut down to use for ship building. European history Early colonial period In 1840 after the signing of the Treaty of Waitangi, paramount chief Apihai Te Kawau made a tuku (strategic gift) of land at Waihorotiu on the Waitematā Harbour to William Hobson, the first Governor of New Zealand, as a location for the capital of the colony to develop. This location became the modern city of Auckland, beginning with a port develop around Commercial Bay. In mid-1840, Apihai Te Kawau relocated the majority of the Ngāti Whātua from the Manukau Harbour to Remuera-Ōrākei on the Waitematā Harbour, closer to the new settlement of Auckland. Dual ports were created on either side of the isthmus for the European settlement: the Port of Auckland on the Waitematā Harbour, and the Port of Onehunga on the Manukau Harbour, separated by nine kilometres. In 1841, the Crown purchased the Kohimarama block from Ngāti Pāoa (6,000 acres extending from Mission Bay south to Panmure). Ngāti Pāoa understood that this deal allowed for Ngāti Pāoa to settle and establish a trading post at Parnell near the new city of Auckland, however no reserves were set aside. Onehunga on the Manukau Harbour became a major port town, facilitating trade with Manukau-based Tāmaki Māori and Waikato tribes, who would sell and barter resources such as peaches, melons, fish and potatoes. By 1855, most Ngāti Whātua Ōrākei lands had either been given as tuku to the Crown, or lost through property speculators, with only the 700-acre Ōrākei block remaining. During the 1860s, affluent members of society in Auckland began to move into the countryside, living at locations such as modern Newmarket and Epsom. During the 1800s, many of the volcanic cones on the isthmus such as Maungawhau / Mount Eden, Te Kōpuke / Mount Saint John and Maungarei / Mount Wellington began to be quarried, so that the scoria could be used for roading materials, however by the end of the century, lava basalt deposits or greywacke from the Hunua Ranges was preferred. By the 1860s, the Albert Park Volcano had been entirely quarried, The isthmus was connected to surrounding areas of Auckland through infrastructure projects. The Panmure Bridge connecting to eastern Auckland farmland and the fencibles settlement of Howick was opened in 1866, followed by the Māngere Bridge linking Auckland south in 1875, and the first Grafton Bridge in 1884, linking the central city to Grafton across the Grafton Gully. Auckland's first railway opened in 1873, the Onehunga Line on the Onehunga Branch between Point Britomart and Onehunga via Penrose, followed soon after by the Southern Line, connecting the isthmus south to Pukekohe by 1875, and as far south on the North Island Main Trunk as Te Awamutu in the Waikato by 1880. The Western Line, a section of the North Auckland Line, was opened on 29 March 1880 connecting Newmarket to Glen Eden, and extended as far north as Helensville by the following year. By the 1920s and early 1930s, tram lines had been constructed, connecting a number of suburbs, including Mount Roskill, Remuera, Meadowbank, Point Chevalier (a suburb that was newly developed in the 1920s), attracting middle income families, while city-adjacent suburbs such as Ponsonby, Freemans Bay and Grey Lynn developed into slums due to the deteriorating 19th century housing stock. The growth of the automobile in the 1920s also led to major concreting and sealing projects on the streets of the isthmus. In the 1930s, the eastern suburbs of the Auckland isthmus were connected to the central city after the construction the Westfield Deviation (now known as the Eastern Line) and Tāmaki Drive in 1932, both constructed on reclaimed strips of Hobson Bay and the Ōrākei Basin. Overcrowding and poor quality housing began to be combatted in the 1930s by the use of town planning and state housing projects. By 1945, the areas of Waterview and Mount Roskill had also been developed as state housing projects. The kāinga and marae at Ōkahu Bay were seized and burned in 1952, under the pretense of beautification for the royal visit of Queen Elizabeth II in 1953, and the residents were relocated to nearby state housing. 1950s–1983: motorways, immigration and suburban sprawl s being manufactured at Ōtāhuhu in 1966. By 1967, New Zealand had one of highest per capita car ownership rates in the world. in 1975. By the mid-1950s, motorways became a new type of civil engineering project that began to dominate the isthmus. The first section that opened was the Northwestern Motorway in 1952, connecting Westerview to the Te Atatū Peninsula in West Auckland, to create a dedicated corridor to reach the civilian airport at Whenuapai. By the mid-1950s, a new location at the Māngere Aerodrome became the favoured location for an international airport, and the Auckland Airport was opened at Māngere in 1966, while the Whenuapai airport remained as the RNZAF Base Auckland. The construction of the Central Motorway Junction caused businesses to relocate away from Karangahape Road, adjacent to the junction, causing the area to become established as a red-light district. Funding for this project was scrapped in the 1970s by the Third National Government. By 1964, western developments at New Windsor and Mount Roskill, south-eastern developments at Oranga and Mount Wellington, and remaining patches such as Tāmaki led to the Auckland isthmus becoming a contiguous urban sprawl. As people moved towards the suburbs, the CBD and adjacent central suburbs declined in popularity. Due to minimal planning requirements, central Auckland apartments developed a reputation for poor design. Since the 1990s, measures to combat urban sprawl have been undertaken by the Auckland councils, especially developing medium and high density housing around urban centres and public transport nodes. and was opened in 2003. In 2001, John Banks was elected as the Mayor of Auckland City on a platform of creating the Eastern Motorway, connecting the CBD to East Auckland and the eastern isthmus suburbs, to alleviate the congestion problems faced by Auckland. From the late 2000s onwards, a number of public transport projects have been created to alleviate congestion, such as the Northern Busway (2008), electrification of Auckland railways (2014–2015), a more frequent public transport network (2016–2019), and the Eastern Busway (AMETI) (2021–2026). The City Rail Link, an underground rail loop linking Britomart to the Western line, has a planned opening date of 2024, while plans for two light rail corridors, one line connecting the CBD to Mount Roskill, Māngere and the Auckland Airport, with the second connecting the CBD to northwestern Auckland, are in the planning stages. A number of legislative changes such as the 2016 Auckland Unitary Plan and the National Policy Statement on Urban Development have allowed higher density building in the isthmus and across the Auckland region. The more liberal Immigration Act 1987 led to increased immigration from Asia in the 1990s, and Auckland became a prominent destination for international students. The Auckland isthmus, especially the CBD, became attractive to international students due to tertiary institutions such as the University of Auckland, the Auckland University of Technology and local secondary schools. Language schools and private training establishments specialising in subjects such as tourism and hospitality became common in central Auckland. By the mid-2000s, the population of the Auckland CBD was significantly more transient than most other areas of New Zealand, due to the large number of students, international tourists and domestic tourists. ==Demographics==
Demographics
The Auckland Isthmus covers and had an estimated population of as of with a population density of people per km2. The Auckland isthmus had a population of 395,772 in the 2023 New Zealand census, a decrease of 3,168 people (−0.8%) since the 2018 census, and an increase of 22,128 people (5.9%) since the 2013 census. There were 193,956 males, 199,668 females and 2,142 people of other genders in 146,091 dwellings. 5.4% of people identified as LGBTIQ+. There were 61,317 people (15.5%) aged under 15 years, 95,634 (24.2%) aged 15 to 29, 186,687 (47.2%) aged 30 to 64, and 52,101 (13.2%) aged 65 or older. == Local government ==
Local government
. Road boards were the first local government on the isthmus in the 1850s and 1860s outside of the colonial city, which were established due to a lack of central government funding for road improvements. By 1883, there were 69 road districts across Auckland, however as the population of the isthmus increased, these bodies merged into different boroughs and counties. Attempts to create local government on the isthmus began in 1851, hampered by extensive costs for roads and the 1860s economic downturn, however by April 1871 the Auckland City Council had been established around the modern-day CBD. This led to amalgamations with Arch Hill (1913), Grey Lynn (1914), Parnell, Remuera and Eden Terrace in 1915, followed by Epsom (1917), Point Chevalier (1921), Avondale (1927) (a merger which increased the Auckland City area by 40%), and eventually Ōrākei and rural Tāmaki to the east of the isthmus in 1928. which merged the three cities and remaining boroughs: Ellerslie, Mount Eden, Mount Roskill, Newmarket, Onehunga and One Tree Hill. On 1 November 2010, the Auckland City was merged with the surrounding metropolitan and rural areas to form a single Auckland Council unitary authority. Since the formation of the council, the Auckland isthmus has been divided into five wards: the Waitematā and Gulf ward, Albert-Eden-Puketāpapa ward, Maungakiekie-Tāmaki ward, Ōrākei ward and Whau ward. The Waitematā and Gulf ward includes the Hauraki Gulf / Tīkapa Moana islands that had been administered by the Auckland City Council, while the Whau ward includes a mix of suburbs previously administered by Auckland City and Waitakere City. The western edge of the isthmus forms the border between the Northern electricity network (serving West Auckland, the North Shore and the northern Auckland Region) and the Auckland network. Power consumers within the Auckland network are able to vote for the trustees of Entrust, an electricity consumers trust and the majority shareholder of the electricity company Vector Limited, while also receiving annual dividends. ==References==
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