In Nordic mythology, the world tree Yggdrasil (or the tree of life) played a central role.
The tree grew in the middle of the world and had roots that spread to the different worlds.
One root reached Asgård, the home of the Aesir, the other Jotunheim with the giants, and a third root extended to Hel's realm of death. 

Read more about the tree of life Yggdrasil HERE

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