Could it be that Genabackis was intended as some sort of homage to this earliest of all Tolkien maps? The two look very much the same... except these continents curve in opposite directions. But the rest is somewhat similar. Big inland seas, and there’s also the fact that the first colonists – Noldor or Malazan – both landed onto the northwestern tip…
Maybe it’s just a coincidence, but I really dig that kind of mysteries. Like finding bizarre symmetry between Lawrence of Arabia and Dune. (There is one all right.)