The Ōreti River (formerly the Oreti River) is one of the main rivers of

Southland, New Zealand Southland ( mi, Murihiku) is New Zealand's southernmost region. It consists mainly of the southwestern portion of the South Island and Stewart Island/Rakiura. It includes Southland District, Gore District and the city of Invercargill. The r ...

, and is long. The river has been identified as an

Important Bird Area An Important Bird and Biodiversity Area (IBA) is an area identified using an internationally agreed set of criteria as being globally important for the conservation of bird populations. IBA was developed and sites are identified by BirdLife Int ...

BirdLife International BirdLife International is a global partnership of non-governmental organizations that strives to conserve birds and their habitats. BirdLife International's priorities include preventing extinction of bird species, identifying and safeguarding ...

because, for much of its length, it supports breeding colonies of

black-billed gull The black-billed gull (''Chroicocephalus bulleri''), Buller's gull, or tarāpuka (Māori) is a Near Threatened species of gull in the family Laridae. This gull is found only in New Zealand, its ancestors having arrived from Australia around 250, ...

s. The New Zealand

Ministry for Culture and Heritage The Ministry for Culture and Heritage (MCH; ) is the department of the New Zealand Government responsible for supporting the arts, culture, built heritage, sport and recreation, and broadcasting sectors in New Zealand and advising government on ...

gives a translation of "place of the snare" for . In November 2019, the name of the river was officially altered to Ōreti River. The Ōreti has its headwaters close to the

Mavora Lakes Mavora Lakes is a protected area in the South Island of New Zealand consisting of two lakes: North Mavora and South Mavora. The lakes are drained by the Mararoa River. The area is managed by the Department of Conservation An environmental m ...

between

Lake Te Anau Lake Te Anau is in the southwestern corner of the South Island of New Zealand. The lake covers an area of , making it the second-largest lake by surface area in New Zealand (after Lake Taupō) and the largest in the South Island. It is the larg ...

and

Lake Wakatipu Lake Wakatipu ( mi, Whakatipu Waimāori) is an inland lake (finger lake) in the South Island of New Zealand. It is in the southwest corner of the Otago region, near its boundary with Southland. ''Lake Wakatipu'' comes from the original Māori nam ...

, and flows south across the

Southland Plains The Southland Plains is a general name given to several areas of low-lying land in the South Island of New Zealand, separated by the rise of the Hokonui Hills in the north. It forms a sizeable area of Southland region and encompasses its two pr ...

to its outflow into

Foveaux Strait The Foveaux Strait, (, or , ) separates Stewart Island, New Zealand's third largest island, from the South Island. The strait is about 130 km long (from Ruapuke Island to Little Solander Island), and it widens (from 14 km at Ruapuk ...

at the southeastern end of

Oreti Beach Oreti Beach is the central bay of three lying on the Foveaux Strait coast of Southland, New Zealand, the others being Te Waewae Bay and Toetoes Bay. Twenty-six kilometres in length, the bay lies between the town of Riverton and the outflow of th ...

. En route, it runs through the towns of Lumsden and Winton, before passing through the city of

Invercargill Invercargill ( , mi, Waihōpai is the southernmost and westernmost city in New Zealand, and one of the southernmost cities in the world. It is the commercial centre of the Southland region. The city lies in the heart of the wide expanse of t ...

, close to the river's

estuary An estuary is a partially enclosed coastal body of brackish water with one or more rivers or streams flowing into it, and with a free connection to the open sea. Estuaries form a transition zone between river environments and maritime environment ...

. For the final part of the river's length, around the city of Invercargill and the river's estuary just south of the city, it is known as the New River, a name occasionally encountered to refer to the whole river. It shares this estuary with several smaller rivers, most notably the Waihopai River. The New River Estuary, which meets the end of the Ōreti River before it reaches the sea, is in decline. Recent science reports show that regions of the upper estuary are under stress and showing eutrophication. There is excessive macroalgal growth including sediment quality decline and high concentrations of chlorophyll-a in the water column. Chlorophyll-a was used as an indicator of eutrophic conditions in the water column, and is a colour pigment present in many types of algae that can give an indication of how much algae is present in the water column. The

Invercargill Rowing Club The Invercargill Rowing Club is a New Zealand rowing club. History The club was established on 26 August 1875, with clubrooms on the New River Estuary. In 1904, Mr. G.O. Joyce was its captain. The club relocated to the Ōreti River in 1958. ...

relocated to the river in 1958.

References

Rivers of Southland, New Zealand Important Bird Areas of New Zealand Foveaux Strait Rivers of New Zealand {{Southland-river-stub