The Eglinton River is located in the southwest of New Zealand. It flows through Fiordland National Park for 50 kilometres. Its headwaters are at Lake Gunn, 25 kilometres east of Milford Sound, and it flows generally south before entering Lake Te Anau along the lake's eastern shore opposite the entrance to North Fiord.
For much of its length the Eglinton is accompanied by the only road in the region, State Highway 94 from Te Anau to Milford Sound. The southern end of the Milford Track is located close to the Eglinton River.
