I reported a bug a while back where you can freely explore the map edges and even fall off the side of the map with no consequences. There's a lot of nice stuff out there, likely detailed enough to make the world seem like it goes on and on. Falling off the side results in trampoline mode (bouncing up and down once you get to the bottom) until you get out. I honestly wouldn't mind this bug never being fixed because exploration is a massive part of the game for me and seeing the corners of the map does NOT detract from my gameplay experience.