|Basin countries||New Zealand|
|Length||39 kilometres (24 mi)|
The Otaio River is a river of the south Canterbury Region of New Zealand's South Island. It initially flows north from its source on the northern slopes of Mount Studholme in the Hunters Hills, turning northeast to enter the southern end of the Canterbury Plains. It then turns southeast, reaching the Pacific Ocean to the south of the town of St Andrews.
"Place Name Detail: Otaio River". New Zealand Geographic Placenames Database. Land Information New Zealand. Retrieved 12 July 2009.
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