These lost realms include:
Ennui - Realm of Tedius Maximus, Daedric Prince of Extreme Boredom. An endless, flat plain of nothing but grass and a couple of abandoned strip malls. There is absolutely nothing to do here except go mad. It's like Nebraska, only without the corn.
Buggebegon - Realm of Dael Gribel, Daedric Prince of Pest Control. A thick green mist hangs over this barren, treeless, yet very much bug-free wasteland. Here and there you'll find a bird's nest filled with very easily broken eggs. A hazmat suit is recommended.
Indiana - Realm of Harrison Ford, Daedric Prince of action-adventure serials. No hijackers are allowed in this realm - any hijackers who stumble upon it will be told to "GET OFF MY PLANE (of Oblivion)!
Heck - Realm of Phil, Daedric Prince of Insufficient Light and Minor Transgressions. This realm is home to many mildly inconvenienced souls who have committed slightly naughty acts that cannot really be considered evil. Y'know, leaving the toilet seat up, hording the little mints that they keep at the receptionist's desk at the office, bad breath - those sorts of things.