Human habitation and influence on the landscape in the Amazon seems far more extensive in scope and duration than previously thought, based on recent discoveries.

https://duckduckgo.com/?q=Amazon+mounds+archaeology&t=ffip&i...

https://duckduckgo.com/?q=Amazon+australasian+dna&t=ffip&ia=...

The significance of the second link is ancient peoples further north and in other parts of the Americas don’t share this genetic link, indicating a longer timeline of human habitation in the region than previously thought.

For sure! While there were definitely civilizations there, there are still huge areas that were likely never clear cut. And even the areas where pre-colonial civilizations had developed have been reforested for 600+ years, which by itself makes it interesting forest.