yeah, the giant river is also known, doesn't exist now because it's all under desert sand, the Tamanrasset, and the geography exactly matches what Plato wrote in Critias

it is also known that the whole region was warm subtropical and rainy up to about 5000 years ago, and multiple texts in egypt have been found that talk about the crazy-high-tech "gods" living over to the west of them, as are the granite CNC lathed vases (which are milled to a precision we can barely even measure let alone set our robots to do right now), and the tube drills

but the point about antarctica is true as well... the last pole movement was ~12000 years ago and was the backstory of the Great Flood which the abraham religions wrongly think was 6000 years ago (it was a disaster time but not a pole shift time). this is how it came to be that antarctica has all the evidence of having been a subtropical forest landscape at one time

it is interesting to note that the region of egypt has figured big in all this history because of its crust composition... there is currently a plasma bubble under it now, and another one on the ontipodes in the pacific, because there is a strong magnetic field in the rock under the place, and you can also learn something interesting by looking at a lightning strike map... the two regions with the lowest strike counts are mongolia and the region around egypt, this also indicates that the shalow surface rock under these places is very insulated, high silica, low metal content

i'm still uncertain about a lot of the finer details of all these things but the existence of a prior, highly advanced civilization in northern africa is without question, as is the location of the former atlantean capital city, built on top of an ancient weathered volcano (that's why the rings and layers, it's a natural formation that lent itself to sculpting into a canal based city with locks and pumps) and the overall elevation of the rocks that remain indicate that it is not exceedingly tall, so pumping that water up to the top inner rings is not gonna be expensive 

 The Aztecs claim to have come from a place (maybe city) called Aztlan to their north. That would be west of Egypt... And linguistic construct could conceivably turn Aztlan into Aztlantis - this 'tis' being a suffix denoting subject, like in the Altaic languages, or could mean it's a city or a counting particle. I'm just speculating on how you could get Atlantis out of Aztlan, without knowing which language to look in 

 there is no doubt at all that both the aztecs and the egyptians derived their entire culture from some kind of unknown, pyramid building, advanced civilization, and that at some point they were corrupted into becoming sun worshiping king cults

i'm not surprised to hear that there could be a link between the word aztec and atlantis either... after all, between the two is a whole ocean named this now