Ruamahanga River

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Ruamahanga River
NZ-Ruamahanga R.png
The Ruamahanga River system
Origin Mount Dundas, Tararua Ranges
Mouth Palliser Bay, Cook Strait
Basin countries New Zealand
Length 124 km (77 mi)
Source elevation 1,504 m (4,934 ft)
Mouth elevation 0 m (0 ft)
Basin area 3,470 km2 (1,340 sq mi)
Left tributaries Tauweru River
Right tributaries Waipoua River, Waingawa River, Waiohine River, Lake Wairarapa outlet

The Ruamahanga River runs through the southeastern North Island of New Zealand.

The river's headwaters are in the Tararua Ranges northwest of Masterton. From there it runs firstly south and then southwest for 130 kilometers before emptying into the Cook Strait. The towns of Masterton and Martinborough are close to the banks of the river. It is joined by many other rivers, including the Tauweru River near Gladstone.

In its lower reaches, the river meanders across a large floodplain, culminating in the wetlands around the edges of Lake Wairarapa. The river once flowed into the lake, but has now has been diverted. The river drains at Palliser Bay ten kilometers further south.

Trout fishing is a popular activity and there are many swimming holes in the upper reaches.

In popular Maori legend a Taniwha (Mythical monster) lives in the river, he has been angered since the river was diverted and is believed to have been responsible for the death of many people.

Coordinates: 41°22′S 175°09′E / 41.367°S 175.150°E / -41.367; 175.150