Yggdrasill, the world tree, is a giant ash supporting the Nine Worlds. Each root of the tree connects to a different realm such as Asgard, Jotunheim, Muspelheim, Alfheim, Vanaheim, Nidavellir, Svartalfheim, Niffleheim. The root also connects to the earthly realm of Midgard.
At its base were three wells: Urdarbrunnr (Well of Fate), from which the tree was watered by the Norns (the Fates); Hvergelmir (Roaring Kettle), in which dwelt Nidhogg, the monster that gnawed at the tree’s roots; and Mímisbrunnr (Mimir’s Well), source of wisdom, for the waters of which Odin sacrificed an eye. After Ragnarök, the world tree, though badly shaken, was to be the source of new life.
The "World Tree" existed on this reality in Asgard as well as the Earth, until it was destroyed by the Children of Tomorrow . In this reality, a World Tree was also located on the planet Halycon. 
In the Marvel Cinematic Universe, Yggdrasil is adapted as a constellation linking the Nine Realms through a cosmic channel. Thor insists that humans are unaware of the cosmos despite glimpses of the tree's branches appearing through the Hubble telescope's images. Yggdrasil first appeared in the 2011 film Thor and is mentioned by the Red Skull in Captain America: The First Avenger.
Yggdrasil is seen when Loki uses the Norn Stones to link all the Nine Realms which includes Earth. Their is also a Tree in Odin's throne room representing the tree and allowed Loki access to the mystical energy of the universe.
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- 31 Appearances of Yggdrasill
- 1 Images featuring Yggdrasill
- Item Gallery: Yggdrasill
- Fan-Art Gallery: Yggdrasill
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