Super Terraria World encompasses an area far beyond the current limitations of Terraria world sizes. To get around that limit, STW offers a new feature that connects all of the world saves together. By walking to the edge of a map, jumping on a boat, or entering a doorway, you can be moved smoothly from one world to another. As STW grows, you will eventually be able to head in one direction, and through world transitions, come full circle, ending right where you started!
A Link Between Worlds:
How did you manage this? Is there any way that this kind of feature could see it's own mod that people could download and use for themselves?