Blackwater River (Tasman)
The 883rd longest river in the world
The Blackwater River in Tasman flows due north along a long straight valley, parallel to and equidistant from, the Mātakitaki and Tutaki Rivers, reaching the Mangles River just to the east of the town of Murchison. It is some 20 kilometres (12 mi) in length.
Flows through: New Zealand.
River data from Wikidata (CC0); lengths normalised to a common unit.