The Ōtira River is located in the central South Island of New Zealand. It rises on the slopes of Mount Rolleston in the Southern Alps, and flows north for 20 kilometres (12 mi), passing through the town of Otira before joining the Taramakau River.^[1] The Taramakau's outflow is into the Tasman Sea, 12 kilometres (7.5 mi) south of Greymouth.

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Ōtira River
Upper Ōtira River and Ōtira Viaduct
Route of the Ōtira River
Mouth of the Ōtira River Show map of New Zealand Ōtira River (South Island) Show map of South Island
Location
Country	New Zealand
Physical characteristics
Source	Mount Rolleston
• coordinates	42.9022°S 171.5231°E / -42.9022; 171.5231
Mouth
• location	Taramakau River
• coordinates	42°45′43″S 171°37′59″E
Length	20 km (12 mi)
Basin features
Progression	Ōtira River → Taramakau River → Tasman Sea
Tributaries
• left	Curtis Creek, Kea Creek, Park Creek, Hodge Creek, Rolleston River, Goat Creek, Kellys Creek
• right	Pegleg Creek, Candys Creek, Reid Falls, Wesley Creek, Barrack Creek, Deception River, Paratu Stream
Bridges	Ōtira Viaduct, Wallace Point Bridge, Yorkeys Point Bridge, Ōtira River Bridge, Morrison Footbridge

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The valley of the Otira River forms the northwestern approach to Arthur's Pass, one of the three main passes across the Southern Alps.