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This is the confluence of the Amazon Basin's main ‘black’ and ‘white’ rivers – the Rio Negro and the Solimões respectively – forming the Amazon River in Brazil. Rio Negro is the largest tributary of the Amazon and the world’s largest black-water river. The dark colour comes from dissolved decaying vegetable matter, the white colour from sand, mud and silt.

CREDIT: ESA.

Source:
http://www.esa.int/Our_Activities/Observing_the_Earth/Earth_from_Space_Meeting_of_waters