[1] A major tributary of the Whanganui River, it flows west then south from its sources on Pureora and north of the Hauhungaroa Range, northwest of Lake Taupō, before reaching the Whanganui River at the town of Taumarunui.

The valley is followed by State Highway 4, from near Ongarue,[2] and by the North Island Main Trunk railway for about 30 km (19 mi),[3] from near Waimiha.

[2] Tributaries of the Ongarue include the Maramataha and Taringamotu Rivers[2] and the Mangakahu Stream.

[3] Kayaks can navigate up to Waimiha, except in a narrow gorge near Paraketu and shallow rapids below Taringamotu.

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