A lost civilization has emerged from beneath the dense forest of the southwestern Amazon after airborne laser scanning revealed thousands of geometric earthworks, perfectly straight roads and enormous ceremonial centers built from earth. The discovery is attributed to the Aquiry civilization, a multicultural society that spread across roughly 183,000 square kilometers between 600 BC and 850 AD, housing far more people than previously believed.
The scale of the find would have been impossible to grasp without LiDAR technology. By penetrating thick vegetation and mapping the ground's contours, the aerial scans allowed researchers to calculate that more than 20,000 ceremonial centers are spread across the region, with some complexes covering as much as 50 hectares. The long-held idea of a historically untouched Amazon collapses under this evidence. Instead, the region held a dense, highly active network of interconnected communities.
Mapping a hidden urban landscape
Excavations and radiocarbon testing estimate that between 1.25 million and 3 million people lived in Aquiry territory in the early first millennium. Because this territory represents less than 3% of the entire Amazon, earlier estimates that only 1 million to 10 million people lived across the whole rainforest no longer hold up. Everything points to the region as a whole having been home to tens of millions of inhabitants.
The Aquiry did more than build monuments. They actively reshaped the landscape, using controlled burning to clear areas dominated by bamboo to make way for crops of maize, squash and cassava, as well as roads and plazas. They also actively promoted the planting of trees such as the Brazil nut and the peach palm, permanently altering the composition and biodiversity of the rainforest seen today.
A lasting mark on the climate
This human footprint was not insignificant. It changed the atmosphere's carbon balance for centuries, a detail now considered important for calibrating current climate models.
The reason the civilization went undiscovered for so long comes down to materials. Because the Amazon basin has no stone, the Aquiry built everything from earth. With no stone ruins to mark the sites, vegetation swallowed them whole until laser scanning was able to see beneath the canopy.
An unsolved collapse
Researchers still do not know what language the Aquiry spoke or why the civilization collapsed so suddenly around 850 AD, a period close to the decline of the Maya. What is known, thanks to Indigenous oral traditions, is that these centers served as gathering points for political and spiritual exchange, filled with festivals, music and feasting. LiDAR is not only unearthing ruins, researchers say. It is forcing a rethink of the Amazon's history and of humanity's own relationship with nature.
