The Mamaku Ranges are a range of rugged hills in the North Island of New Zealand. Located to the west of Lake Rotorua and north of Lake Taupo, they lie to the immediate south of the Kaimai Range and can be thought of as an extension of it, in much the same way that the Kaimai Range can be considered an extension of the Coromandel Range. The hills terminate in the south with the valley of the Waikato River.