Aldermen Islands

The Aldermen Islands are a small group of rocky islets to the southeast of Mercury Bay in the North Island of New Zealand. They are located off the coast of the Coromandel Peninsula, 20 kilometres (12 mi) east of the mouth of the Tairua River.

Aldermen Islands
A bay on one of the Aldermen Islands.
Geography
LocationMercury Bay in the North Island
Coordinates36°58′S 176°05′E
Area1.3 km2 (0.50 sq mi)
Administration
Demographics
Population0

The islands were named 'the Court of Aldermen' by Captain Cook and his crew on 3 November 1769 after previously naming Mayor Island.[1] The Aldermen group consists of four main islands: Hongiora, Middle, Ruamahuanui, and Ruamahuaiti. The smaller islands include Big Hump, Little Hump, Nga Horo Island, Half Island and The Spire. Their combined area is 133.5 ha (330 acres).[2] The islands are a forested nature reserve hosting rare species including the tuatara. Access is by permit only.

The Aldermen Islands are the remains of eroded Pliocene or Early Pleistocene lava domes that form part of the Whitianga Group.[3] Approximately 18,000 years ago during the Last Glacial Maximum when sea levels were over 100 metres lower than present day levels, the islands were hilly features surrounded by a vast coastal plain. Sea levels began to rise 7,000 years ago, after which the islands separated from the rest of New Zealand.[4] When sea levels were lower, the Tairua River flowed south of the features, travelling eastwards towards the Pacific Ocean.[4]

See also

References
  1. Cook, J., Wharton, Sir W. J. L. (1968) Captain Cook's journal during his first voyage round the world, made in H. M. Bark 'Endeavour', 1768-71 : a literal transcription of the original mss ; with notes and introd. ed. by Captain W. J. L. Warton. Adelaide: Libraries Board of South Australia.
  2. "Data Table - Protected Areas - LINZ Data Service (recorded area 133.5463 ha)". Land Information New Zealand. Retrieved 3 September 2019.
  3. "Alderman Islands". Global Volcanism Program. Smithsonian Institution. Retrieved 12 June 2020.
  4. "Estuary origins". National Institute of Water and Atmospheric Research. Retrieved 3 November 2021.

36°58′S 176°05′E


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