Amazonia LiDAR Reveals Over 20,000 Precolonial Earthworks

Canopy-penetrating LiDAR data has revealed the presence of over 20,000 precolonial earthworks in the northern part of southwestern Amazonia, a discovery that significantly expands previous archaeological estimates for the entire Amazonian region. The findings, published online on July 29, 2026, in the journal Nature, indicate that this specific area alone contains a quantity of earthworks comparable to the total previously estimated for all of Amazonia. This advanced remote sensing technology, LiDAR (Light Detection and Ranging), uses laser pulses to map terrain beneath dense forest canopies, allowing archaeologists to identify structures that would otherwise remain hidden. The earthworks identified are believed to be remnants of complex societies that inhabited the region centuries or millennia before European arrival. These structures likely served various purposes, including defensive fortifications, ceremonial sites, agricultural modifications, and residential areas, suggesting a much larger and more sophisticated precolonial population than previously understood. The sheer scale of these discoveries challenges existing narratives about the demographic and societal complexity of Amazonia in pre-Columbian times. Previous archaeological work in the Amazon basin, while extensive, was often limited by the difficulty of surveying vast, densely forested areas. LiDAR technology has overcome this significant hurdle, providing an unprecedentedly detailed view of the landscape and its hidden archaeological features. The research team utilized LiDAR data collected over the northern part of southwestern Amazonia, a region known for its rich but often inaccessible archaeological potential. The analysis of this data led to the identification of a vast network of interconnected earthworks, including mounds, ditches, and platforms, spread across the landscape. These findings suggest a highly organized and labor-intensive approach to landscape modification by ancient populations. The implications of this discovery extend beyond mere numbers; they necessitate a re-evaluation of the environmental impact and societal organization of precolonial Amazonian peoples. Understanding the extent and nature of these earthworks can provide crucial insights into their agricultural practices, social structures, and their relationship with the Amazonian environment. Further research will likely focus on dating these structures, understanding their specific functions, and exploring the connections between different earthwork complexes. The study, published in Nature with the DOI 10.1038/s41586-026-10835-7, marks a significant advancement in Amazonian archaeology and highlights the transformative power of new technologies in uncovering the past.