|River mouth||confluence with the Ruamahanga River|
|Length||28 km (17 mi)|
|Progression||Ruamahanga – Cook Strait|
The Kopuaranga River is a river of the Wairarapa, in New Zealand's North Island. It flows generally south from rough hill country southwest of Eketahuna, reaching its outflow into the Ruamahanga River 5 kilometres (3 mi) north of Masterton.
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