The Manganui o te Ao River is a river of the centre 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...

's North Island

North Island

The North Island is one of the two main islands of New Zealand, separated from the much less populous South Island by Cook Strait. The island is in area, making it the world's 14th-largest island...

. It has its source in numerous streams and small rivers which flow west from the slopes of Mount Ruapehu

Mount Ruapehu

Mount Ruapehu, or just Ruapehu, is an active stratovolcano at the southern end of the Taupo Volcanic Zone in New Zealand. It is 23 kilometres northeast of Ohakune and 40 kilometres southwest of the southern shore of Lake Taupo, within Tongariro National Park...

, though the main course of the river flows predominantly southwest through rugged hill country to meet with the Whanganui River

Whanganui River

The Whanganui River is a major river in the North Island of New Zealand.Known for many years as the Wanganui River, the river's name reverted to Whanganui in 1991, according with the wishes of local iwi. Part of the reason was also to avoid confusion with the Wanganui River in the South Island...

 10 kilkometres north of Pipiriki, at the edge of the Whanganui National Park

Whanganui National Park

The Whanganui National Park is a national park located in the North Island of New Zealand. Established in 1986, it covers an area of 742 km² bordering the Whanganui River. It incorporates areas of Crown land, former state forest and a number of former reserves. The river itself is not part of the...

.