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
Blackwater River (New Zealand) Blackwater River (New Zealand) Blackwater River is the name of three rivers in the northwestern South Island of New Zealand, one flowing into the Mangles River, one into the Buller River between Westport and Inangahua Junction (named due to the dark coloured waters the Māori discovered), and one into the Māwheraiti (Little Grey) River. All three rivers are within a few kilometres of each other, to the south and east of Westport. The easternmost of the three Blackwater Rivers flows due north along a long straight valley, parallel to and equidistant from, the Matakitaki and Tutaki Rivers, reaching the Mangles