The Ōtira River is located in the central

South Island The South Island, also officially named , is the larger of the two major islands of New Zealand in surface area, the other being the smaller but more populous North Island. It is bordered to the north by Cook Strait, to the west by the Tasman ...

of New Zealand. It rises on the slopes of Mount Rolleston in the

Southern Alps / Kā Tiritiri o te Moana The Southern Alps (; officially Southern Alps / Kā Tiritiri o te Moana) is a mountain range extending along much of the length of New Zealand's South Island, reaching its greatest elevations near the range's western side. The name "Southern ...

, and flows north for , passing through the town of

Otira Otira is a small township fifteen kilometres north of Arthur's Pass in the central South Island of New Zealand. It is on the northern approach to the pass, a saddle between the Otira and Bealey Rivers high in the Southern Alps. A possible meani ...

before joining the

Taramakau River The Taramakau River is a river of the West Coast Region of the South Island of New Zealand. It rises in the Southern Alps / Kā Tiritiri o te Moana near Harper Pass, due east of Hokitika, and runs westward for into the Tasman Sea south of Gr ...

. The Taramakau's outflow is into the

Tasman Sea The Tasman Sea (Māori: ''Te Tai-o-Rēhua'', ) is a marginal sea of the South Pacific Ocean, situated between Australia and New Zealand. It measures about across and about from north to south. The sea was named after the Dutch explorer Abe ...

, south of

Greymouth Greymouth () (Māori: ''Māwhera'') is the largest town in the West Coast region in the South Island of New Zealand, and the seat of the Grey District Council. The population of the whole Grey District is , which accounts for % of the West Coas ...

. The valley of the Otira River forms the northwestern approach to

Arthur's Pass Arthur's Pass, previously called Camping Flat then Bealey Flats, and for some time officially Arthurs Pass, is a township in the Southern Alps of the South Island of New Zealand, located in the Selwyn district. It is a popular base for explorin ...

, one of the three main passes across the Southern Alps.

References

Westland District Rivers of the West Coast, New Zealand Arthur's Pass National Park Rivers of New Zealand {{WestCoastNZ-river-stub