Setting local spawn to
x = 2134, y = 1000
Max x to 24000
Max y to 10000
This gives you the entire world (at default scale of 6) while stopping you from creating another world
Adjusting the spawn anywhere else cuts the other side of the world in two
The current position splits a bit of Alaska
Doing any part above/below the equator would also split the north/south in two.