Rio Negro

The Rio Negro is a major tributary of the Amazon River that flows through northwestern Brazil and meets the Amazon near Manaus. Its acidic, tannin-stained water gives it a characteristic dark color.

Blackwater river: A river whose water is darkened by dissolved organic matter and is typically acidic and nutrient-poor. The Rio Negro is one of the world's largest examples of this river type.
Rio Negro basin: The drainage region whose streams and rivers flow into the Rio Negro. Its forests and waters form the geographic system sustaining the river.
Guiana Shield: An ancient geological formation underlying parts of northern South America. Uplands of the shield help define the Rio Negro's headwaters and tributary landscape.
Rio Negro Sustainable Development Reserve: A protected area in Amazonas state that supports conservation alongside traditional livelihoods. It protects floodplain environments and community use within the Rio Negro region.
Meeting of Waters: The confluence near Manaus where the dark Rio Negro and pale Solimões flow side by side before mixing. Differences in temperature, speed, and sediment keep the two rivers visibly distinct for kilometers.
Anavilhanas Archipelago: A protected complex of river islands and channels in the lower Rio Negro near Manaus. Seasonal flooding creates its shifting mosaic of islands, lakes, and forest.
Amazon Basin: The enormous lowland drainage basin traversed by the Amazon River and its tributaries. The Rio Negro occupies the basin's northwestern sector.
Amazon deforestation: The clearing or degradation of forests across the Amazon Basin. Deforestation threatens the watershed processes that sustain Rio Negro ecosystems.
Amazon flood pulse: The seasonal rise and fall of Amazonian rivers that floods forests and renews aquatic habitats. Annual water-level swings reshape the Rio Negro's flooded forests and river margins.
Jaú National Park: A large protected area of rainforest and blackwater ecosystems in Amazonas state, Brazil. It conserves an extensive section of the Rio Negro basin and its tributaries.

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