The WaihÃÂhàRiver is a river of the Waikato Region of New Zealand's North Island. It flows from its origins in several streams west of Lake Taupà Â, the most important of which are the Mangatu and Waitaia streams, which have their headwaters in the Hauhungaroa Range. The Waihaha flows into the Western Bay of Lake Taupà  at the settlement of WaihÃÂhÃÂ, north of Kuratau.