My favorite single-player map is relatively old - created no later than beta 1.1. Since then, the terrain generation algorithms have changed. When I explore any farther, I'm faced with glitches like sliced mountains and differences in sea level.
I tried making a new world with the same seed, but it turned out completely different.
Is there a way to smooth the transition between the old and new automatically, or will I have to run around terraforming myself?