I'm so clumsy with words... :-/ You can replicate terrains and they will be tiled together. By selecting "Seamless" in the Replicator function, you can connect them together. There has been talk about truly fractal terrain tiling but I don't know if that is being considered currently or if Eovia has the time to implement something like that for the C5 final release. Eovia likes to blindside beta testers with new capabilities. :-D Oh, and don't forget the, "Create what I'm imagining" button is also on the list of to-do's. ;)