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|Main source||Mount Ruapehu|
|River mouth||Whangaehu River|
|Length||18 km (11 mi)|
The Wahianoa River is a river of the Manawatu-Wanganui Region of New Zealand's North Island. One of the headwaters of the Whangaehu River, it flows southeast from the southern slopes of Mount Ruapehu, gradually veering southwest before meeting the Whangaehu 3 kilometres (2 mi) northwest of Waiouru.
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