WHERE AM I AND WHY IS THERE SO MUCH WATER

I think I noclipped. I’m not entirely sure, but I woke up here. There’s a lot of water, I’m really not the best swimmer and it’s VERY cold. I’ve resorted to floating on my back for now, floating houses appear in the water every now and then but they’re pretty far away and I don’t think I can swim there without them being swept away. I keep feeling something brush past my leg, anyone have any idea how to get out? Please?