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
Robinson River (New Zealand) Robinson River (New Zealand) The Robinson River is a river in the West Coast Region of the South Island of New Zealand. It is a tributary of the Upper Grey River and much of the river lies within the Lake Sumner Conservation Park. Rising on the slopes of Mount Boscawen () on the main divide about south of the Lewis Pass, the river runs west-southwest along a straight, narrow valley before turning northwest to reach the Upper Grey. Some older maps show the river as the Marchant River or the Marchant Robinson River. A two-day tramping track known as the