Ancient Amazon Civilization May Have Held 3M People on Just 3% of the Forest

New estimates suggest a pre-Columbian Amazonian civilization supported roughly 3 million people while occupying only about 3 percent of the rainforest’s total area. If accurate, the population was densely concentrated rather than thinly spread across the basin.

Note: the source text supplied here contained only the headline, not the article body. A fuller summary — covering the survey methods, evidence, dating, and researchers behind the estimate — would require the actual article content, which was not provided. I have not invented those details.