In the fiction of J. R. R. Tolkien
or the Grinding Ice
was an icy waste between the lands of Aman
. Its exact nature is left a little unclear, but it seems to have been broken and shifting pack ice covering the northernmost parts of the Great Sea Belegaer
Helcaraxë is first recorded as having been crossed by Melkor and Ungoliant after the darkening of the Trees, then later by Fingolfin and his people.