The Outlands is a large stretch of land that has been abandoned for millennia. No one really knows why for sure; some have tried to venture into this forbidden territory, but none ever get very far. The reasons why tend to vary.
Hostile fauna.
Hostile flora.
Too easy to get turned around.
Ghosts.
No matter who you ask, though, all will tell you of a pervading sense of unease. Something bad happened here once, long ago.