The discovery feels surprising because it flips a long-held idea: that the southwestern Amazon was mostly untouched wilderness before Europeans arrived. A newly published research study shows that ancient communities living around Bolivia’s Lake Rogaguado and Lake Ginebra built huge earthworks, engineered water systems, and managed diverse crops. This new evidence shows the region supported complex societies whose influence lasted nearly one thousand years.
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Summary: This study reveals how ancient communities engineered large-scale farming landscapes around Bolivia’s lakes using raised fields, ditches, and canals. These new findings challenge old ideas about Amazonian history and show how Indigenous innovation shaped resilient food systems for nearly a thousand years.
The researchers found three major phases of ancient occupation, each revealing new strategies for farming, settlement, and survival in a landscape that floods every year. Earlier studies suggested small, scattered groups lived in these wetlands. The new findings show the opposite: people built circular and square ditches, raised fields, platforms, water channels, and even islands designed to stay dry during the rainy season. These engineered landscapes show planning, cooperation, and surprisingly advanced farming systems.
To prove this, the team used LiDAR, a laser-based scanning technology that can see through dense forest. It revealed massive hidden structures, including 200-meter-wide ditches, grid-like agricultural fields, and long canals that guided water during floods. Excavations at Paquío and Jasschaja uncovered pottery, plant remains, animal bones, tools, and layers of shells that showed what people ate and how they lived. Radiocarbon dates confirmed a timeline stretching from AD 500 to 1400.
This matters because it shows that Amazonian peoples did not simply adapt to nature. They transformed it. The raised fields kept crops dry during floods and moist during droughts. The canals directed water like a slow-moving irrigation system. People grew maize, managed palms, collected forest fruits, and fished in the lakes. These ancient agroforestry systems helped support stable communities long before modern farming existed. Today, similar ideas could help design climate-resilient agriculture for flood-prone regions.
Experts say the study challenges outdated assumptions about “empty” Amazonian landscapes. Lead author Carla Jaimes-Betancourt explains that the Llanos de Moxos were a major cultural hub shaped by innovation, not isolation. Other scholars note that the detailed plant remains at Jasschaja, including the first archaeological record of Amazonian nut south of the Madre de Dios River, show intentional resource management rather than simple gathering. The contrast between the two lake regions also points to different ecological strategies over time.
The findings also connect to bigger global questions. As climate pressures grow, scientists look to Indigenous knowledge and past land-use systems for guidance. These ancient engineered wetlands resemble modern nature-based solutions, which store carbon, protect biodiversity, and reduce flood risk. They also highlight how cultural loss, deforestation, and industrial farming have erased sustainable practices once common in the region.
The next step is deeper investigation. Researchers plan to expand LiDAR surveys, collect more botanical samples, and work closely with local Indigenous communities to uncover oral histories linked to these landscapes. Many questions remain, including how large the settlements were, how communities shared resources, and how environmental shifts shaped their rise and decline. Early evidence suggests even larger networks of earthworks remain hidden beneath vegetation.
The study’s takeaway is clear: the ancient societies of the southwestern Amazon reshaped their world with skill, creativity, and engineering. Their legacy lies beneath the lakes, revealing that the Amazon’s past was not empty or simple, but full of innovation that still holds lessons for the future.
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Journal Reference:
Jaimes-Betancourt C, Fernandez G, Shock MP, Nina H, Delgadillo H, Prestes-Carneiro G, Lima A, Nunes VM, Torrico R. Historic landscapes, diversified livelihoods in the southwestern Amazon: the case of Lake Rogaguado and Lake Ginebra (Bolivia). Frontiers in Environmental Archaeology, 2025. 4(1662950). DOI: 10.3389/fearc.2025.1662950