Firth of Thames

A true-colour image showing the Hauraki Gulf (centre). The Firth of Thames is the large bay to the southeast. The image was acquired by NASA's Terra satellite on 23 October 2002.

The Firth of Thames is a large bay located in the north of the North Island of New Zealand. It is the firth of the rivers Waihou and Piako, the former of which was formerly named the Thames River, and the town of Thames lies on its southeastern coast.

Its original name is Tikapa.

The firth lies at the southern end of the Hauraki Gulf, southeast of the city of Auckland. It occupies a rift valley or graben between the Coromandel Peninsula and Hunua Ranges which continues into the Hauraki Plains to the south.


The Firth of Thames is an important site for waders or shorebirds, and is listed as a wetland of international importance under the Ramsar Convention. The Miranda Shorebird Centre, operated by the Miranda Naturalists' Trust, is located on the western shore of the bay at Miranda.

However, the firth overall is severely damaged by man-made influences, especially dairy-farm run-off, and has not recovered from large-scale mussel dredging over 40 years after the practice ceased (more information in the Hauraki Gulf article).[1][2]

Whales such as southern right whales (one of two of the first confirmed birth records in main islands waters since the end of commercial and illegal whaling was observed in Browns Bay region in 2012) and Bryde's whales can be seen in the bay to calve and rest.[3]


  1. Nash, Kieran (26 June 2011). "Health of gulf in danger of collapsing". The New Zealand Herald. Retrieved 30 June 2011.
  2. "The Hauraki Gulf Marine Park, Part 2". Inset to The New Zealand Herald. 3 March 2010. p. 4.

Coordinates: 37°00′S 175°25′E / 37.000°S 175.417°E / -37.000; 175.417

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