Upano Valley sites - Credit: Wikimedia Commons
Upano Valley sites - Credit: Wikimedia Commons
The Upano Valley sites are a cluster of archaeological sites in the Amazon rainforest. They are located in the Upano River valley in Morona-Santiago Province in eastern Ecuador. The sites comprise several cities; they are believed to have been inhabited as early as 500 BC, predating any other known complex Amazonian society by over a millennium. Read more on Wikipedia
Source: en.wikipedia.org