The Waipā River is the largest tributary of the Waikato River, flowing north from the central King Country hills through Otorohanga and Pirongia before joining the Waikato at Ngaruawahia. This extensive river system offers a mix of beautiful backcountry scenery and productive fishing across its length, characterized by gravel beds, native bush, and farmland. While it receives fishing pressure in some areas, the river supports a healthy population of trout, with particularly rewarding opportunities for anglers willing to explore its more remote stretches.