Fanua lies just far enough off the coast that you can't see it from Atano. It's said that when you drive out in a boat, the island rises at the horizon exactly when you cross the original town border. I doubt anyone can spot exactly where the old border lies in the murky water.
It is also known as "the fairy island", and in local folk lore it's home to strange creatures and forces not of this world.
It is said that from the belfry of the old church Fanua was in sight. And it is said that the day the church tower was completed was the day the ground started sinking in. They say that at low tide the tip of the tower is just below the water surface and you can see the ripples it causes. They also say that it has been like that for as long as anyone can remember, even though the ground below Atano has continued sinking lower and keeps sinking to this day.
They say that from the top floors of the Sadina Tower the island should be visible, but isn't. I'm sure no one who says that has ever be