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in Norse mythology, the cold, dark, misty world of the dead, ruled by the goddess Hel. In some accounts it was the last of nine worlds, a place into which evil men passed after reaching the region of death (Hel). Situated below one of the roots of the world tree, Yggdrasill, Niflheim contained a well, Hvergelmir, from which many rivers flowed. In the Norse creation story, Niflheim was the misty region north of the void (Ginnungagap) in which the world was created