Ogygia

Players may be lucky enough to find Ogygia, an island at the edge of the world, early in the game. It is excellent for resources and such. It is also visually stunning, full of lush environments. However, Ogygia only appears for a day (real life) or so.

Its only inhabitants are Calypso and invisible nymphs. Calypso provides a health bonus, similar to a campfire. Players can buy many exotic plants, seeds, and eggs from her. The nymphs are the only bad thing about Ogygia. If Calypso is not visible from where the player is standing, they will immediately start punching you, and the will not stop until either they die or Calypso comes back.

Unless you die or use a magic mirror(assuming you have not slept on Ogygia yet), once your entire screen is on the island, you will not be able to leave until it fades away.