The mystical home of the elves. They had retreated into myth and legend millenia ago; disappearing from all but the most ancient tales. Centuries later, an expedition was sent to see if they existed at all, and found a continent to the west; with the remnants of a civilization without a populace. All that had been found was some coastal outpost with a barely recognizable word; ‘Praemia’.
Retreating to their ships; as the human commander thought there was a chance at plague, or some debased magic(as the ship’s mage went crazy upon landfall) they stayed just long enough to re-supply and head home.
So the continent named ‘New Praemia’ was ‘discovered’ and then promptly forgotten.