A “lost valley of cities” has been discovered in the Amazon rainforest that was once home to more than 10,000 farmers around 2,000 years ago.
Experts said the discovery in the foothills of the Andes changed what was known about the history of people in the region. A series of earth mounds and buried roads in the Upano area in eastern Ecuador was first noticed more than two decades ago by archaeologist Stéphen Rostain.
