Jotunheim is one of the nine worlds, the homeland of the jotuns (The name means "giantland.") frost giants and rock giants. Situated in Midgard, on the middle level of the Norse universe, Jotunheim is separated from Asgard by the river Iving, which never freezes over. otunheim was usually thought of as being far to the northwest, in a place where the ocean met the edge of the world. It lies in the snowy regions on the outermost shores of the ocean.
Mimir's well of wisdom is in Jotunheim, beneath the Midgard root of the ash tree Yggdrasil. Jotunheim is ruled by Thrym ("uproar"), the feared king of the frost giants. The stronghold of Utgard, the chief city of Jotunheim and the abode of the giants, is ruled by the giant Utgard-Loki. Other strongholds include Gastropnir, home of the giantess Menglad, and Thrymheim ("house of uproar"), mountain stronghold of the giant Thiazi.
After the first gods, Bor's sons Odin, Vili, and Ve, killed the giant Ymir and made the world, they granted land to the descendants of the giants along the outer shores of the ocean. It was a cold, forbidding land of vast, towering forests, mighty mountains, rivers, and caverns. The giants inhabiting it were frost giants and mountain giants.
Another name for Jotunheim was Utgard (or Utgardr, "outer enclosure"), though Utgard was sometimes regarded more specifically as the capital city of Jotunheim. Utgard was first settled by Norfi, or Narfi, the father of Nott (Night).