|River mouth||Manawatu River|
|Length||27 km (17 mi)|
The Mangatewainui River is a river of the Manawatu-Wanganui Region of New Zealand's North Island. An upper tributary of the Manawatu River, it flows generally southeast from its sources in the Ruahine Range northwest of Norsewood, and meets the young Manawatu River 8 kilometres (5 mi) east of Dannevirke.
The Mangatewainui River should not be confused with its northern neighbour, the Mangatewai River.
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