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
Blue River (New Zealand) Blue River (New Zealand) The Blue River is a small river in the South Island of New Zealand. It flows its entire length within the Mount Aspiring National Park, and although on the southeastern side of the main divide, the river is within the boundaries of the West Coast region for its entire length. The headwaters are southeast of the main range of the Southern Alps near the mountain Eyetooth, with the smaller Blue River North Branch and South Branch joining the main Blue River later. Shortly before flowing into the Makarora River, the river passes through a narrow gorge.