|Garde Manger Guy|
Multiple cities and colonies. Roanoke, Camelot, Atlantis, Aztalan, Lyonesse, El Dorado, and Julfar to name a few from real world examples and legends. Lots of lost ships drawn through from the Bermuda or devils triangle. (drifting alone with no crew aboard or whatever curse dragged them here)
For sake of completeness I will add an epic level Demon with Mythic levels named Dri-Aire (the e is silent)who summons socks from multiple alternate dimensions. His lair is a brightly lit almost friendly looking laundromat where scantily clad attendants cheerfully stuff fresh loads of mismatched socks into his gaping maw. He does this so that he can fully manifest himself into all of the prime material planes at once (like a low rent Cthulhu) and bring about the end of matching pairs of socks for everyone forever.