description Rio Negro Overview
The Rio Negro is a major tributary of the Amazon and one of the world's largest blackwater rivers. Its dark, typically acidic water contains dissolved organic matter and tannins from vegetation in the surrounding forests, rather than sediment causing the color. The river flows through northwestern Brazil and meets the Solimões at Manaus, where the two differently colored waters form the Amazon River at the Meeting of Waters.
help Rio Negro FAQ
Why is the Rio Negro's water black?
Its dark color comes mainly from dissolved organic matter and tannins released by forest vegetation. It is not primarily caused by heavy sediment, which is why the Rio Negro is classified as a blackwater river.
Where does the Rio Negro meet the Amazon River?
The Rio Negro meets the tan-colored Solimoes River near Manaus, Brazil, at the Meeting of Waters. The two rivers flow side by side for a distance before their waters fully mix.
Is the Rio Negro a tributary of the Amazon?
Yes. It is one of the Amazon's major tributaries and one of the world's largest blackwater rivers.
What makes the Rio Negro different from the Solimoes?
The Rio Negro carries dark, typically acidic water rich in tannins, while the Solimoes carries lighter, sediment-rich water. Their contrasting colors are especially visible near Manaus at the Meeting of Waters.
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