The Inangahua River is located in the northwest of New Zealand’s South Island. It is a major tributary of the Buller River, which it joins at the town of Inangahua Junction.The Inangahua flows northwest for 35km, turning north after it passes through the town of Reefton. From here it continues for 30km before reaching the Buller some 40km from the larger river’s outflow into the Tasman Sea near Westport.The decommissioned Reefton Power Station operated with water taken from the river.