The Amazon’s Hidden Cities Expose a Blind Spot in How We Count the Past

The forest was never an empty map For centuries, the Amazon was commonly portrayed as a place that resisted large-scale human settlement. Its soils were considered too poor, its climate too demanding, and its vegetation too dense to support anything beyond small, mobile communities. That picture is becoming harder to defend. As [Science reported](https://www.science.org/content/article/odd-shapes-hidden-dense-amazon-rainforest-reveal-sprawling-ancient-civilization), geometric earthworks detected across part of the southern Amazon point to extensive pre-Columbian settlement. Population estimates associated with this wider archaeological picture reach roughly 3 million people in an area representing only a small fraction of the forest—about 3%, according to the estimate highlighted in coverage. The exact number remains model-dependent. Earthworks do not translate neatly into simultaneous residents, and different sites may have been occupied in different periods. Nor should the evidence be compressed into a single, unified Amazonian civilization. The region contained many societies with distinct languages, political systems, and land-use practices. Still, the central finding is d