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