The Hangaroa River is a river in the Gisborne Region

Gisborne Region

The Gisborne Region is an area of northeastern New Zealand governed by the Gisborne District Council, a unitary authority. Its largest settlement, the city also named Gisborne, is located at the northern end of Poverty Bay on the east coast....

 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...

. It has its sources in the Huiarau Ranges in the Te Urewera National Park

Te Urewera National Park

Te Urewera National Park is one of fourteen national parks within New Zealand and is the largest of the four in the North Island. Covering an area of approximately 2,127 km², it is in the north east of the Hawke's Bay region of the North Island....

, and flows south and east to merge with the Ruakituri River

Ruakituri River

The Ruakituri River is a river of the Gisborne Region of New Zealand's North Island. A major tributary for the Wairoa River, it initially flows northeast from its sources north of Lake Waikareiti. It turns southeast for the majority of its course , reaching the Wairoa at the settlement of Te...

 near Te Reinga. The combined rivers form the Wairoa River

Wairoa River, Hawke's Bay

The Wairoa River runs south for 65 kilometres from the inland east coast region of New Zealand's North Island, west of Gisborne, before flowing into northern Hawke Bay at the town of Wairoa....

, which flows south into Hawke Bay

Hawke Bay

Hawke Bay is a large bay on the eastern coast of the North Island of New Zealand. It stretches from the Mahia Peninsula in the northeast to Cape Kidnappers in the southwest, a distance of some 100 kilometres....

.

There are rainbow trout

Rainbow trout

The rainbow trout is a species of salmonid native to tributaries of the Pacific Ocean in Asia and North America. The steelhead is a sea run rainbow trout usually returning to freshwater to spawn after 2 to 3 years at sea. In other words, rainbow trout and steelhead trout are the same species....

 in the upper reaches. The upper river has a rock and stone bed, and flows through native bush with pools and short stretches of rapids. The lower river flows through farmland and contains brown trout

Brown trout

The brown trout and the sea trout are fish of the same species....

.