Their dwelling is beside the "Spring of fate," beneath the "world-tree," Yggdrasil's ash, which they water with draughts from the spring.
One of the most striking conceptions of Northern mythology is that of the " world-tree," Yggdrasil's Ash, which sheltered all living beings (see Yggdrasil).
In it, you can find the Nordic mythology of Yggdrasil described in some detail.
Vigfusson and York Powell (Corpus Poeticum Boreale, Oxford, 1883) see in Yggdrasil not a primitive Norse idea, but one due to early contact with Christianity, and a fanciful adaptation of the cross.
"Thor's Oak" of Scandinavian mythology and "Yggdrasil," the "Tree of Life," of the early Germanic tribes closely resemble the modern Christmas tree.