Upokororo (the Eglinton River) flows from Ōtapara (Lake Gunn) in a generally southern direction before entering Te Ana-au (Lake Te Anau). Upokororo is the Māori name for the now extinct New Zealand grayling (Prototroctes oxyrhynchus). The young of this slender, silvery smelt were once common in lowland freshwater rivers and streams, and grew to maturity in saltwater. The Upokororo River was part of the traditional travel route that provided access between Te Ana-au and Piopiotahi (Milford Sound).

2014-191-029, Te Rūnanga o Ngāi Tahu Collection, Ngāi Tahu Archive / Photograph: Tony Bridge.