A World Tree (世界樹 Sekaiju?) is a giant tree that produces mana present in several religions and mythologies, particularly Indo-European religions, Siberian religions, and Native American religions. The world tree is represented as a colossal tree which supports the heavens, thereby connecting the heavens, the terrestrial world, and, through its roots, the underworld. It may also be strongly connected to the motif of the tree of life.
Their names are similar, they both have wells underneath them: the Well of Eternity beneath Nordrassil, and the Well of Urd beneath one of the roots