Thanks to a guy on Youtube named Erick (Covenant of Love), I've come upon an intriguing website called "The Wheel of Time" (miguelgoitizolo.com). (And it's thanks to Chace and Queenie Cameron that I came upon Erick's YT channel.) There's a page on this site about "The Primordial Civilization," which seemingly corroborates the theory of the Garden in Eden going back to around 47,000 BC.
According to this website all of these ancient civilizations that we're aware of--Sumeria, Egypt, the Sarasvati in India, the Incas, the Mayans, the Olmecs and even Atlantis--can all be traced back to an even earlier, original civilization called "Hyperborea." It was situated on an island located in the ocean that encompasses the country of the Celts. (Of course the Celts were not around that long ago.) This island has been depicted as a mountain paradise surrounded by a surging sea and thus made inaccessible. Hyperborea existed at the beginning of the current Manvantara--a Hindu span of time being a lengthy period of 51,840 years--that we're rapidly coming to the end of.
The author of the aforementioned website, Mr. Goitizolo, argues that the Book of Genesis' description of the Garden being somewhere in the Middle East is purely symbolic--that what Genesis is truly describing is Hyperborea.
Genesis 2 says that the Garden was located in the land of Eden. A river "went out of Eden to water the garden": Pison, Gihon, Hiddekel, and the Euphrates. It says that Pison "compasseth the whole land of Havilah, where there is gold..." From what we know Havilah was in the southern part of Africa, where the Anunnaki were mining for gold. Gihon "compasseth the whole land of Ethiopia." Hiddekel "goeth toward the east of Assyria." And then we have the Euphrates. From what I can tell the way these rivers are listed makes it look like the author is going in a circular direction--that is in a clockwise direction. The picture being painted is that of a paradise location (the Garden) that is the "supreme center," as Mr. Goitizolo puts it, of this primordial earth. Hyperborea is said to have been in the northern region. Could it be that what is being said about the Garden in Gen. 2--in relation to the four rivers--is that it was situated at the North Pole (the top of the world)?
Mr. Goitizolo quotes from Diodorus quoting from a document called "Manifest of Hecateus," which says that there was on the island of Hyperborea a "magnificent" forest dedicated to the "Sun god" and a bizarre temple "of circular shape." Perhaps after Hyperborea fell into ruin this temple looked something like in the drawing above.