Builders of more than 400 geometric ditched enclosures - squares, circles and octagons cut into the terra firme between the Acre and Iquiri rivers, revealed as the forest was cleared in the 20th century.
Enclosure-building wound down by around 1400; the makers' descendants persisted as dispersed forest peoples, the geoglyphs swallowed by regrown rainforest until modern deforestation exposed them.
The atlas holds 2 border frames for Acre Geoglyph Builders — the shape you scrub through changes in 1000 BC · 1.
The ditched earthworks of the western Amazon and managed forest landscapes in this survey of the pre-Columbian Americas.
Amazonian earthwork societies, broad archaeological context for the Acre geoglyph builders.