In the mud I play, the wilderness is a map of ascii "hexes" showing various terrains. The cities and various other locations are shown in certain hexes and the location of everything is static. (In recent times, the amount of travel in each hex has been added to its text desc. Travel density determines the frequency of critters that appear and the amount of resources available.)
Anyway, back to the main point. The world is theoretically infinite. As far as I understand the code, hexes which haven't been in use for a while are flushed from the system and regenerated when someone enters them. You can swim any direction in the ocean which surrounds the landmasses, and the game will keep creating ocean hexes for you to travel in up until the point you get so far out that the mud crashes, heh.
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