Helm's Deep

[Yrobryn]

Helm's Deep was a large valley in the north-western Ered Nimrais (White Mountains).
Originally the valley was home to a small Gondorian regiment, but after Calenardhon became Rohan it became an encampment of the Rohirrim, where the guards of the Fords of Isen lived.
During the War of the Ring the fortress guarding Helm's Deep again became the refuge of some of the Rohirrim, now under King Théoden, and the Battle of the Hornburg was fought there.