All islands except War Island have sages and wizards. And while each continent does have a different amount, Dwilight does have more regions than other continents for them to wander through.
Also, while I'm on the topic, even if its the wrong thread...
Since, many many months ago, sages and wizards were updated to stick to human regions, their increased density may account for the perception of increased magic on continents. Which, again, is why I think its a good idea to increase sage/wizard eagerness to travel elsewhere after doing something.
