I started looking at those a few years ago on Google earth. To say it’s fascinating is like calling the sun “large”. The entire area for hundreds of square miles and into the jungles where it continues because you can still see the lines in the rivers...
Imagine if you will, Los Angelese viewed from the air after a few H bombs detonate above it would look like. Nothing left but the outlines of roads and waterways, ditches and earthworks.
Sort of like a giant flood came and washed everything away... Naw...
To see more in this area, look up Atlantis, Bolivia. Somewhere down there is the remains of some pretty startling structures as well. Like giant lego blocks only extremely intricate and edges that are still razor sharp.
Remember those alien runways, monkeys and spiders drawn on the desert floor that drew such a pizazz back in the 70s? That’s just a tiny bity corner of all the amazing stuff down there.
this is of a piece with surveys I’ve seen of amazonian jungles that show immense pre columbian habitation.
apparently the diseases the spanish and portugese brought in killed many many millions of natives all over the americas.