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"I don’t automatically accept the theory of Atlantis in South America, but the massive evidence of canals (terra-forming?) is quite stupendous."

There are terraces all over the Andes. It seems like there must have been a much larger population to require all those terraces, or people have lived there for a very, very long time. Do you happen to know if salts build up in terraces over time, making them eventually unviable?

[Fred Nerks]

Lots of terraces, very few are salt:

Maras Salt Terrace, Peru

Salt would hardly have been an issue in the Okavango Delta, it's still flowing with bounteous fresh water today.