Guénon, René
René Guénon (1886-1951) was a noted French esotericist who was strongly influenced by eastern mysticism, becoming a Sufi Muslin in 1912.
He made a clear distinction between Hyperborea and Atlantis placing the former in the north and the latter submerged in the Atlantic, to the west,. An overview of his life and work is available online(a).
(a) https://www.worldwisdom.com/public/authors/Rene-Guenon.aspx