Ohau River
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The Ohau River is a short river (some eight kilometres in length) that links Lake Ohau with the artificial lake, Ruataniwha in the Mackenzie Basin, New Zealand.
Until the construction of the Waitaki River hydroelectric project, it was a tributary of the Waitaki River. The river forms part of the traditional boundary between Otago and Canterbury regions. [1]
[edit] References
http://www.meridianenergy.co.nz/yourhome/frequently+asked+questions/ohaua.pdf