The Deadlands, in the northwest wastes of the Third Realm, are so named because of the high amount of ghosts and undead which seem to congregate there. Few living creatures care to explore up close, but there is a precariously constructed town centered around a circular lake called Hell. The myths say the dead emerge from the underworld from the depths of that lake, which must be a portal between planes. The town is called Naraka.
The wizard tower of necromancy, Aíviloknoor, is nearby; only a few hundred miles to the west.
These undead reaches that sprawl from the shores of Hell, where phantoms and corpses wander and build brittle, malformed shelters are more specifically referred to as Gravehollow.