High Quality Content by WIKIPEDIA articles! The Waiotauru River is a river of the Wellington Region of New Zealand's North Island. IT flows generally north from two branches, the Southern Waiotauru River and the Eastern Waiotauru (or Snowy) River. BOth of these branches have their origins in the southwestern Tararua Range, with the Eastern branch having its origin on the slopes of Mount Hector. THe Waiotauru meets the Otaki River 15 kilometres southeast of Otaki.