Online Reference For Body, Mind & Spirit

Term: Andumnos

(Gaulish) - The Underworld / Otherworld / Netherworld which corresponds to the Greek Elysian Fields and Tartaros, and to the Teutonic Valhall and Hel. There are many isles of the Celtic Otherworld. Andumnos was later called Annwn in Welsh, and Andomhain in Early Irish (Gaelic).
SOURCE:  The Truth About Druids, Tadhg MacCrossan