The Mangaturuturu River is a river of the centre of New Zealand's North Island. One of the headwaters of the Manganui o te Ao River, it flows west from the slopes of Mount Ruapehu, joining with numerous other small rivers to become the Manganui o Te Ao 20 kilometres (12 mi) northwest of Ohakune. It has also been known as Sulphur River, or Sulphur Creek. In April 1975 a lahar raised the river to 2.1 m (6 ft 11 in) above its flood level. There were also lahars in 1969 and September 1995. Earlier lahars were around 8,500 and 10,500 years ago.