That's higher than the Great Pyramid. Lake Moeris still exists and is not near Giza. The two pyramids are thought to be exaggerations of the Pedestals of Biahmu:

https://en.wikipedia.org/wiki/Pedestals_of_Biahmu

But Herodotus just reported what he was told, like with the gold-digging ants:

https://en.wikipedia.org/wiki/Gold-digging_ant

Which seem to have been real (marmots). So who knows.