|River mouth||Golden Bay|
|Length||8 kilometres (5.0 mi)|
The Onahau River is a river of the Tasman Region of New Zealand's South Island. It has its sources close to the northernmost point of Kahurangi National Park, from where it flows northeast to reach Golden Bay to the northwest of takaka. The smaller Little Onahau River follows a roughly parallel course to the southwest of the Onahau River.
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