Rivers of New Zealand Rivers of New Zealand The rivers of New Zealand are used for a variety of purposes and face a number of environmental issues. Many of the rivers in the South Island are braided rivers. The longest river in New Zealand is the Waikato River with a length of . The largest river by volume is the Clutha River with a mean discharge of . Some of the rivers, especially those with wide flood plains and stop banks, have long road bridges spanning them. The Rakaia River is crossed by the longest bridge in New Zealand at . The third longest
Cobb River (New Zealand) Cobb River (New Zealand) The Cobb River is a river in the Tasman Region of New Zealand. It flows southeast from Lake Cobb on the northern slopes of Mount Cobb, in Kahurangi National Park, in the northwestern South Island. The river's waters are captured behind a dam to become the Cobb Reservoir; the outflow continues to join with the Takaka River. The river is named for J.W. Cobb, a local mill owner, who discovered it. Brown and rainbow trout are available for fishing in the river. A tramping track follows the river between Lake Cobb and the reservoir and there