So, I'm sure everyone's at least seen pictures where the world is just a big island on the back of a turtle that for some reason never submerges... Look familiar? Well, it makes no sense to me how that can be, but it got me thinking that if a sufficiently large turtle that didn't submerge had fertile soil on its back, and someone lived on it, that might be what they perceive to be the entire world, or at least, the land. Which got me thinking that maybe such swimming islands could exist, with some hadwaving. There's just one problem: What would it eat? A turtle large enough to have an island on its shell would need large amounts of food, but where would it get that food without submerging? At first, I thought jellyfish, like in real life, but that has issues of its own, like where are they? The turtle can't dive, or the island would sink. And then I thought that perhaps the food is grown on its back, like it eats its own moss, but there's no way that much vegetation could grow within reach of its mouth. If there's giant prey-species, then that means the predators are just as large, so what does that say for the people living on the turtle's back? Or how destructive would it be when it's time for the turtles to mate? Short of females not having islands and the people on the male's back praying that their island doesn't slide off, I don't know how damage would be minimized there. Perhaps there's some level of symbiosis between the creatures on its back and the turtle? There's a lot of questions here, and not all can be answered, but hopefully we can get a conversation going that will help solve these problems.