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Helicopter Lidar scans have revealed an ancient Amazonian “cosmos” of circular settlements, all connected by straight roads. Acre is an Amazonian rainforest state in northwestern Brazil known for Brazil nut trees and the production of rubber. In the west, on the Peruvian border, the Serra do Divisor National Park features high mountains and several waterfalls, and in the southeast is Rio Branco, the state’s capital, on the banks of the Acre River. Lidar scanning specialists from England’s University of Exeter have flown high resolution sensing equipment over the canopy of the rainforest in south Acre State. Not only did they identify 35 circular villages dating to 1300–1700 AD, but all of the settlements are linked by a network of old