An Ash I know standing It is called Yggdrasil
A high tree sprinkled with shining drops
From there come the dews which in the dales fall
It stands ever green above the Well of Urd (or "Above the Well of Weird")
images: Wikimedia Commons (top image, bottom image).
Is Yggdrasil an Ash, or a Yew?
The debate continues to this day, but I am quite sure that the mighty World Tree is found in the Invisible Realm and is seen in the celestial realm, rather than the terrestrial.
Above are two descriptions of Yggdrasil from the Poetic Edda, one from the Voluspa and one from the Grimnismal.
