Acre geoglyphs, Prehistoric earthwork formations in Acre, Brazil
The Acre geoglyphs are prehistoric earthworks spread across the Amazon rainforest landscape, encompassing more than 400 structures with circles, squares, and linear patterns. These shapes were dug directly into the ground and form geometric designs that become visible from above.
The structures were created between 300 BC and 1000 AD and demonstrate advanced engineering skills of pre-Columbian Amazonian societies. This period spans several centuries of cultural development in western Amazonia.
These geometric shapes reveal how indigenous communities organized their lands and made use of the rainforest around them. Visitors can see how people deliberately reshaped the landscape to mark their territories and connection to the environment.
Access to the structures is challenging because they lie deep in the rainforest and are often hard to reach on the ground. A guide with local knowledge is helpful to spot the patterns and navigate safely through the area.
The creators built these structures without metal tools yet used precise measurements for the large-scale designs. Researchers found that the builders worked with simple, locally available materials and remarkable technical skill.
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