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The Retaruke River is a river in the North Island of New Zealand. It joins with the Whanganui River at Whakahoro just above Wade's Landing and downstream from Taumarunui. The river flows through the farming communities of Upper and then Lower Retaruke Valley. Downstream from this junction is the Mangapurua Landing with its Bridge to Nowhere, servicing the ill-fated Mangapurua Valley farming community.