Jotunheim

Jötunheimr (often anglicized Jotunheim) is the world of the giants (two types: rock (or hill giants) and frost (or rime giants), collectively called Jotuns) in the Norse Mythology. From there they menace the humans in Midgard and the gods in Asgard (from whom they are separated by the river Iving). Gastropnir, home of Menglad, and Þrymheimr, home of Þjazi, were both located in Jotunheim, which was ruled by King Thrym. Glæsisvellir was a location in Jotunheim, where lived the giant Gudmund, father of Höfund.
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[Norse] Jotunheim is one of the nine worlds, the homeland of the 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. 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.

Jotunheim (Icelandic, Scandinavian) [from jotunn giant + heimar home, land] In Norse mythology, the home of the giants, one of the nine worlds of the Eddas, described as beyond the ocean which surrounds Midgard, and separated from the home of the gods (Asgard) by Ifing -- the river which never freezes over. Jotunheim stands for the material spheres of life visited by the gods who gain the "mead" of wisdom by embodying in worlds. Such a sphere is the earth and so also are the other planets and celestial bodies, though of varying evolutionary status.