The Firth of Thames ( mi, Tikapa Moana-o-Hauraki) is a large bay located in the north of the North Island of New Zealand. It is the
firth
Firth is a word in the English and Scots languages used to denote various coastal waters in the United Kingdom, predominantly within Scotland. In the Northern Isles, it more usually refers to a smaller inlet. It is linguistically cognate to ''fj ...
of the rivers Waihou and Piako, the former of which was formerly named the Thames River, and the town of
Thames
The River Thames ( ), known alternatively in parts as the River Isis, is a river that flows through southern England including London. At , it is the longest river entirely in England and the second-longest in the United Kingdom, after the R ...
lies on its southeastern coast.
Its Maori name is ''Tikapa''. In traditional legend, the firth and the greater
Hauraki Gulf
The Hauraki Gulf / Tīkapa Moana is a coastal feature of the North Island of New Zealand. It has an area of 4000 km2,taniwha
In Māori mythology, taniwha () are large supernatural beings that live in deep pools in rivers, dark caves, or in the sea, especially in places with dangerous currents or deceptive breakers (giant waves).
They may be considered highly respected ...
named Ureia, who takes the form of a whale.
The firth lies at the southern end of the
Hauraki Gulf
The Hauraki Gulf / Tīkapa Moana is a coastal feature of the North Island of New Zealand. It has an area of 4000 km2,Auckland
Auckland (pronounced ) ( mi, Tāmaki Makaurau) is a large metropolitan city in the North Island of New Zealand. The most populous urban area in the country and the fifth largest city in Oceania, Auckland has an urban population of about ...
. It occupies a
rift valley
A rift valley is a linear shaped lowland between several highlands or mountain ranges created by the action of a geologic rift. Rifts are formed as a result of the pulling apart of the lithosphere due to extensional tectonics. The linear d ...
Coromandel Peninsula
The Coromandel Peninsula ( mi, Te Tara-O-Te-Ika-A-Māui) on the North Island of New Zealand extends north from the western end of the Bay of Plenty, forming a natural barrier protecting the Hauraki Gulf and the Firth of Thames in the ...
and
Hunua Ranges
The Hunua Ranges is a mountain range and regional park to the southeast of Auckland city, in the Auckland and Waikato regions of New Zealand's North Island. The ranges cover some and rise to 688 metres (2255 ft) at Kohukohunui.
, which continues into the
Hauraki Plains
The Hauraki Plains are a geographical feature and non-administrative area (though Hauraki Plains County Council existed from 1920 to 1989 and a statistical Area Unit remains) located in the northern North Island of New Zealand, at the lower ( ...
to the south.
Conservation
The Firth of Thames is an important site for
wader
245px, A flock of Dunlins and Red knots">Red_knot.html" ;"title="Dunlins and Red knot">Dunlins and Red knots
Waders or shorebirds are birds of the order Charadriiformes commonly found wikt:wade#Etymology 1, wading along shorelines and mudflat ...
s or shorebirds, and is listed as a wetland of international importance under the
Ramsar Convention
The Ramsar Convention on Wetlands of International Importance Especially as Waterfowl Habitat is an international treaty for the conservation and sustainable use of Ramsar site, Ramsar sites (wetlands). It is also known as the Convention on W ...
. The Miranda Shorebird Centre, operated by the Miranda Naturalists' Trust, is located on the Seabird Coast, 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
The Hauraki Gulf / Tīkapa Moana is a coastal feature of the North Island of New Zealand. It has an area of 4000 km2,
Whale
Whales are a widely distributed and diverse group of fully aquatic placental marine mammals. As an informal and colloquial grouping, they correspond to large members of the infraorder Cetacea, i.e. all cetaceans apart from dolphins and ...
s 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.