The good/bad/evil biomes are somewhat random. It won't always be evil up there. Most of the times I ran the script, the Mediterranean was an evil ocean.
Scary...
To go into deeper explanation, Perfect World has no control over good and evil biomes.
The game generates noise maps for all the different features of the game like good and evil biomes, and then overlays it on the geography map that is produced by Perfect World. Because of a quirk in the way the game does this, it makes it extremely likely that very lage biomes (like oceans) are going to have at least one peak in either good or evil, and that will make the
entire ocean either good or evil based upon which peak or trough you run across first in the randomization.
Hence, large enough oceans in Perfect World are essentially
always going to be either good or evil.
Likewise, the game will make either the north or south end of the map the "glacial" side of the map, and there's no control over that (but at least it's a 50-50 chance that you'll come up with the one you want).
When I've seen other people do these Perfect World maps, they tended to do an entire chunk of a hemisphere to get around the fact that glaciers appear at one end of the map, which is a little odd if you have glaciers in Spain.
Making the northern border of the map the Alps, so that you just pretend it being an ice-capped mountain range for your glaciers is a clever trick.