
Sculpted from the clay rich soils of Amazonia, the earthworks are made up of 30ft wide and 10ft high. The earthen structures or 'geoglyphs' can now be spotted against the treeless, savannah-like landscape and scientists have compiled an archive using Google Earth. A team of researchers have analysed all the findings in a paper published in the journal Antiquity.
They found that most earthworks were clustered on a 200m high plateau at the top of river valleys. This would have given inhabitants a defensive advantage with a clear view of people coming up river. Most were also placed near spring water sources. (Daily Mail)