Rio Negro (Amazon)

The Rio Negro is a river which flows through the Amazon rainforest in north-western Brazil, in the state of Amazonas.

It is the largest blackwater river in the world. It is called Negro (Spanish and Portuguese for "black") because its waters are colored by particles of humus, which make them look much like tea.Villa, Marco Aurelio. 1964: Aspectos geográficos del Territorio Federal Amazonas . Corporación Venezolana de Fomento. Caracas. 191p.Zinck, Alfred. 1986. Venezuelan rivers. Cuadernos Lagoven Lagoven, S.A. Caracas. 64p. 

The Rio Negro is the largest tributary of the Amazon on the left-hand side (as it goes towards the sea). It starts in Colombia and ends in the Amazon basin.

Rio Negro has a very high species richness. About 700 fish species have been documented in the river basin, and it is estimated that the total is 800–900 fish species, including almost 100 endemics and several undescribed species.Hales J. and P. Petry 2013. Rio Negro . Freshwater ecoregions of the world. Retrieved 12 February 2013 Among these are many that are important in the aquarium trade, including the cardinal tetra.

 References 

Category:Rivers of Brazil
Category:Rivers of Venezuela
Category:Rivers of Colombia