Recent LiDAR surveys across southwestern Amazonia have mapped extensive networks of geometric earthworks, prompting researchers to estimate that the ancient Aquiry civilization once supported up to three million people. This challenges the long-standing mainstream narrative that the pre-Columbian rainforest was only capable of sustaining small, scattered nomadic tribes. By exposing thousands of hidden monuments and interconnected road systems, the findings force a complete rethink of Amazonia as an engineered landscape rather than a pristine wilderness.