|River mouth||North Taranaki Bight|
|Length||18 kilometres (11 mi)|
The Onaero River is a river of the Taranaki Region of New Zealand's North Island. It rises on the slopes of Taramoukou, 14 kilometres south of Urenui, reaching the sea two kilometres to the west of the same town.
"Place Name Detail: Onaero River". New Zealand Geographic Placenames Database. Land Information New Zealand. Retrieved 12 July 2009.
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