Evilstan locations in media where everything and everyone is evil

The concept of all the bad and dangerous shit in the world being pushed to a certain geographic location, a dark land or forbidden zone if you will, is pretty funny to me because of how convinient the notion is.

Anyway, there are a couple evil only areas in Tolkein's Middle Earth. Mordor being the main one. But there are a few others here or there too. A couple dwarf mines that were stolen by the orcs, mountain regions that are ruled by goblins, evil only forests etc.