The Kōpuaranga River is a river of the Wairarapa, in New Zealand's North Island. It flows generally south from rough hill country southwest of Eketāhuna, reaching its outflow into the Ruamāhanga River north of Masterton.
In December 2019, the approved official geographic name of the river was gazetted as "Kōpuaranga River".
See also List of rivers of Wellington Region List of rivers of New Zealand
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