Helm's Deep

A deep gorge near the north-western end of Ered Nimrais, at the entrance to which was built the Hornburg; named after King Helm, who took refuge from his enemies there in the Long Winter of III 2758-9.

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A refuge of the Rohirrim.
The great coomb, and the caverns behind it, that lay in the northern valleys of the White Mountains. Helm, King of Rohan, took refuge here with his people in the time of the invasion of Rohan by the Dunlendings.