The river did not flow continuously in its modern form. The Andes: Architect of the River The age of the Amazon is inseparable from the growth of the Andes.
From Ancient Sea to Modern River: The Amazon's Prehistoric Origins
Forests retreated, and the river fragmented into isolated lakes and streams. Findings indicate that a proto-Amazon river system was flowing across South America approximately 9 to 10 million years ago, during the Miocene epoch.
Biodiversity and the Ancient Flow. Current evidence strongly supports the "Andean capture" theory.
Tracing the Proto-Amazon: When a Prehistoric Sea Slowly Became a River
The current Amazonian rainforest is relatively young, but the riverbed itself is much older, acting as a stable corridor for life through these volatile environmental changes. 01 Glacial cycles influence the river’s path and tributaries.
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