Elder Scrolls IV: Oblivion - Shivering Isles

It is, you see, the Realm of Madness itself, and the unlucky inhabitants find themselves permanently in the grip of insanity. Precisely which breed of psychosis it is that looms over the heads of its incumbents depends entirely on which part of the isles they originate from, as this is a land that’s split down the middle in two - both geographically and psychologically. A giant ridge runs straight through the isles, and is the political barrier between the two semi-autonomous regions - Mania in the highlands and Dementia in the lowlands. The difference between the two sectors is far more pronounced than whether their road signs read in miles or kilometers; their people, and indeed the landscape itself, takes the form of the area’s name.