Blackwater river
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A blackwater river is a type of river with a slow-moving channel flowing through forested swamps or wetlands. Most major blackwater rivers are in the Amazon Basin and the Southern United States. The t
A swamp-fed stream in northern Florida, showing tannin-stained undisturbed blackwater
The Lumber River as seen from the boat launch at Princess Ann near Orrum, North Carolina
Tea-colored Tahquamenon Falls
Amazon tributary classified as blackwater
A clearwater river is classified based on its chemistry, sediments and water colour. Clearwater rivers have a low conductivity, relatively low levels of dissolved solids, typically have a neutral to s
Blackwater river
…whitewater rivers and have ionic concentrations higher than rainwater. The unique conditions lead to flora and fauna that differ from both whitewater and clearwater rivers. The classification of Amazonian rivers into black, clear, and whitewater was first proposed by Alfred Russel Wallace in 1853 based on water colour…
Like many clearwater rivers, the Xingu has sections with rapids that are home to many threatened rheophilic fish found nowhere else in the world
The confluence of the Madeira River and Aripuanã River (dark). Despite its colour on this photo, Aripuanã is clearwater, while the Madeira is whitewater
The zebra pleco is one of the many species, including several other catfish, that are restricted to clearwater rivers and threatened by dams
Potamotrygon leopoldi is part of a species complex of blackish river rays with contrasting pale spots from Brazilian clearwater rivers