29 July 2026
Aerial laser-scanning data reveal that, from ad 100 to ad 300, an area spanning less than 3% of the Greater Amazonia region probably supported between 1.25 million and 3 million people and contained more than 20,000 human-made earthworks. These findings call for a re-evaluation of the density of pre-colonial Amazonian populations and the influence these civilizations had on present-day tropical soils and forests.
This is a summary of: Pärssinen, M. et al. Over 20,000 precolonial earthworks in the Southwest Amazonia. Nature https://doi.org/10.1038/s41586-026-10835-7 (2026).
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