Water in New Zealand and are of varying types and origins. Many of the lakes in the central North Island area are volcanic crater lakes, while the majority of the lakes near the Southern Alps were carved by glaciers. Hydroelectric reservoirs are common in South Canterbury, Central Otago and along the Waikato River. Over 180,000 kilometres of rivers has been mapped in New Zealand, the longest being the Waikato River with a length of 425 kilometres and the largest river by volume is the Clutha River with a mean discharge of 533 cubic metres per second. New Zealand has many notable waterfalls, some of
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