Taumarunui is a small town in the King Country of the central North Island of New Zealand. It is on an alluvial plain set within rugged terrain on the upper reaches of the Whanganui River, 65 km south of Te Kūiti and 55 km west of Tūrangi. It is under the jurisdiction of Ruapehu District and Manawatū-Whanganui region.

The Whanganui River is a major river in the North Island of New Zealand. It is the country's third-longest river, and has special status owing to its importance to the region's Māori people. In March 2017 it became the world's second natural resource to be given its own legal identity, with the rights, duties and liabilities of a legal person. The Whanganui Treaty settlement brought the longest-running litigation in New Zealand history to an end.