It's the Grinding Ice, when Feanor led the group of elves to Middle earth (him and some others took the ships),and the rest had to go north and cross the Helcaraxe. Here's the definition of it in The Encyclopedia of Arda:
Quote:
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The perilous icy wastes that formerly lay between Aman and Middle-earth in the north of the world. Fingolfin and his people made their way into Middle-earth across the treacherous wastes of the Helcaraxë at the beginning of the First Age.
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[ September 03, 2002: Message edited by: Lothiriel Silmarien ]