Wainui River is the name of four rivers in New Zealand

New Zealand

New Zealand is an island country in the south-western Pacific Ocean comprising two main landmasses and numerous smaller islands. The country is situated some east of Australia across the Tasman Sea, and roughly south of the Pacific island nations of New Caledonia, Fiji, and Tonga...

. There are also several streams in New Zealand called Wainui Stream. Furthermore, several other New Zealand rivers have names starting in "Wainui-", and some of these (most notably the Wainuiomata River

Wainuiomata River

The Wainuiomata River runs southwest through the Wainuiomata Valley located in the southern Rimutaka Ranges in the North Island, New Zealand.-Origin of Name:...

) are colloquially known as "The Wainui River". This is perhaps unsurprising - "Wainui" is Māori

Maori language

Māori or te reo Māori , commonly te reo , is the language of the indigenous population of New Zealand, the Māori. It has the status of an official language in New Zealand...

 for "big water/river".

• Wainui River (Northland)
  Wainui River (Northland)
  -Wainui River, Northland:The Wainui River is a river of the Northland Region of New Zealand's North Island. It flows generally northeast from its sources at the eastern end of the Maungataniwha Range to reach the Oruaiti River five kilometres southwest of the Whangaroa Harbour....
  
  
• Wainui River (Bay of Plenty)
  Wainui River (Bay of Plenty)
  The Wainui River is a river of the Bay of Plenty Region of New Zealand's North Island. It flows north from the Kaimai Range to reach Tauranga Harbour 10 kilometres south of Katikati....
  
  
• Wainui River (Hawke's Bay)
  Wainui River (Hawke's Bay)
  The Wainui River is a river of the Hawke's Bay Region of New Zealand's North Island. It flows generally south through isolated hill country to reach the Pacific coast five kilometres west of Cape Turnagain....
  
  
• Wainui River (Tasman)
  Wainui River (Tasman)
  The Wainui River is a river of the Tasman Region of New Zealand's South Island. It flows north through Abel Tasman National Park from its sources on the slopes of Mount Evans to reach the small Wainui Bay, an indentation close to the eastern end of Golden Bay.-References:...