Over 20,000 precolonial earthworks in the Southwest Amazonia.

Numerous geometric earthworks have been found in southwestern Amazonia, evidence of a monument-building precolonial civilization 1-3 .

Numerous geometric earthworks have been found in southwestern Amazonia, evidence of a monument-building precolonial civilization 1-3 . This knowledge has contributed to the discussion about the deep history and the precolonial urbanism of Amazonia, its sociocultural contexts and…