Mysterious mounds in the southwest corner of the Amazon Basin were once the
site of ancient urban settlements, scientists have discovered. Using a
remote-sensing technology to map the terrain from the air, they found that,
starting about 1,500 years ago, ancient Amazonians built and lived in
densely populated centres, featuring 22-metre-tall earthen pyramids, that
were encircled by kilometres of elevated roadways.
[permaculture] ‘Mind blowing’ ancient settlements uncovered in the Amazon [Terra Preta II],
Lawrence London, 05/26/2022