by VanessaE » Fri Oct 18, 2013 00:52
There's no built-in limit as such, but the map is dynamically generated.
What you could do is write a mod that teleports players backwards say 10 or so nodes when they get beyond a certain distance from your map's spawn point. You could go one step further and manually generate sheer, vertical walls around the periphery of your desired zone, just inside of that limiting radius (to reduce the likelihood of a player reaching the "real" limit and getting teleported backward).
If a player can't walk beyond a certain point because of such a mod, the map beyond that point (plus a bit into the distance) will simply never be generated.