Yggdrasill

Old Norse  Mimameidr  in Norse mythology, the world tree, a giant ash supporting the universe. One of its roots extended into Niflheim, the underworld; another into Jötunheim, land of the giants; and the third into Asgard, home of the gods. 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