The area north of where this interviewer is talking about is where I've explored in Southern Venezuela, it's a canyon area 10x the size of the Grand Canyon that has never been explored to any degree and is all highland jungle.
I won't tell you what I've seen there because, none of you would believe me. This region has been unchanged since the dawn of time. There are no roads or "outsiders" for many hundreds of miles.
There are massive hidden ancient stone cities buried in 300 ft trees.