The Ongarue River is a river of the Waikato and Manawatū-Whanganui regions of New Zealand's North Island. A major tributary of the Whanganui River, it flows west then south from its sources in the northwest of Lake Taupo, passing through the town of Taumarunui before reaching the Whanganui River. Tributaries of the Ongarue include the Maramataha River and the