[2Jedismom]

And even the name of that land perished, and Men spoke thereafter not of Elenna, nor of Andor the Gift that was taken away, nor of Numenore on the confines of the world; but the exiles on the shores of the sea, if they turned towards the West in the desire of their hearts, spoke of Mar-nu-Falmar that was whelmed in the waves, Akallabeth the Downfallen, Atalante in the Eldarin tongue.
[The Silmarillion, Akallabeth, JRR Tolkien]

[Fedora]

> And even the name of that land perished, and Men spoke thereafter not of Elenna, nor of Andor the Gift that was taken away, nor of Numenore on the confines of the world; but the exiles on the shores of the sea, if they turned towards the West in the desire of their hearts, spoke of Mar-nu-Falmar that was whelmed in the waves, Akallabeth the Downfallen, Atalante in the Eldarin tongue.
[The Silmarillion, Akallabeth, JRR Tolkien]

Tolkien bump :-) My personal opinion is that in that part of "Silmarillion", Tolkien is synthesizing: 1) the Biblical accounts of Eden, the Flood, and the exile of Israel; 2) Atlantis, along with the Greco-Roman story of Deucalion; and 3) the British legend of Avalon.