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It flows generally southeast from its sources in the coastal Herangi Range to reach the Mokau River 15 kilometres southwest of Piopio.
Strict definitions refer to it stretching from the mouth of the Waitara River 10 kilometres northeast of New Plymouth to the mouth of the Mokau River.
While still in his teens, he began a series of expeditions in his spare time, joining a party to scale Mount Taranaki in 1857, for example, and undertaking a journey in 1858 up the Mōkau River to Taupo, Lakes Rotomahana and Tarawera, the Tongariro-Ruapehu area, returning via Rangitikei and Wanganui.