The Terrain Slicing & Dynamic Loading Kit is a Unity package aimed primarily
at easing the memory concerns inherent in large game worlds.
By dividing your world into smaller pieces using the slicing tool (note: use of the slicing tool or terrain are not required for dynamic loading), you can dynamically load only the portion of the world that is needed at any given time. You can even create endless looping worlds using this technique.
With the Terrain Slicing & Dynamic Loading Kit, the only limit to your game is your imagination!