Norse cosmology

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Norse cosmology, as it is given us in the source material for Norse mythology recognizes the existence of nine worlds, assigned the ending -heimr (home, realm, or world) or in some cases -garðr (homestead, yard or earth). Apart from Miðgarðr (the "Middle Earth", or the world as we know it), the remaining eight worlds can be structured into pairs of opposing principles:

World Counter-world Contrast
Muspelheim Niflheim Fire and heat - Ice and coldness
Asgard Hel Heaven and heroic dead - Underworld and ordinary dead
Vanaheimr Jötunheimr Creation - Destruction
Álfheim Niðavellir Light - Darkness

The worlds are all connected by Yggdrasil, the world tree. However, there is some inconsistency in the sources, as the world tree – drawing its nutrition from three wells, located in three different worlds – suggests that they are all roughly on the same level, which would indicate for instance a Niflheim in the north, a Muspelheim in the south and a Jotunheim in the east.

On the other hand, the Prose Edda locates Asgard and Alfheim in "the heavens,". The underworld Hel is generally said to border or be situated in Niflheim, yielding a more layered cosmology, something like the chart below. (Rasmus B. Anderson's 1897 translation of the Younger Edda gives a slightly different layering, however.)

The theory and diagram presented here only represent one possible interpretation.

Diagram of the Nine Worlds.
Diagram of the Nine Worlds.
Norse mythology
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Sources: Poetic Edda | Prose Edda | The Sagas | Volsung Cycle | Tyrfing Cycle | Rune stones | Old Norse language | Orthography | Later influence
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The nine worlds of Norse mythology | People, places and things