The Spey River is a river in the Southland Region

Southland Region

Southland is New Zealand's southernmost region and is also a district within that region. It consists mainly of the southwestern portion of the South Island and Stewart Island / Rakiura...

 of New Zealand

New Zealand

New Zealand is an island country in the south-western Pacific Ocean comprising two main landmasses and numerous smaller islands. The country is situated some east of Australia across the Tasman Sea, and roughly south of the Pacific island nations of New Caledonia, Fiji, and Tonga...

. Its entire length lies within the Fiordland National Park

Fiordland National Park

Fiordland National Park occupies the southwest corner of the South Island of New Zealand. It is the largest of the 14 national parks in New Zealand, with an area of 12,500 km², and a major part of the Te Wahipounamu World Heritage site...

. The Spey rises at the Mckenzie Pass and Murrell's Pass either side of Mt Horatio (1380 metres (4,527.6 ft), and the river flows in a northeasterly direction, emptying into the West Arm of Lake Manapouri

Lake Manapouri

Lake Manapouri is a lake in the South Island of New Zealand. Its name is Maori for "sorrowful heart", though this name is misapplied due to an early cartographical error...

 adjacent to the intake of the Manapouri Power Station

Manapouri Power Station

Manapouri Power Station is an underground hydroelectric power station on the western arm of Lake Manapouri in Fiordland National Park, in the South Island of New Zealand...

.
The Dusky Track follows the Spey valley for much of the river's length.