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's called Negro (Spanish and Portuguese for "black") because its waters are colored by particles of humus, which make them not properly black but dark-brown, 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. ISBN 980-259-084-3