‘It is for the Dimrill Dale that we are making,’ said Gandalf. ‘If we climb the pass that is called the Redhorn Gate, under the far side of Caradhras, we shall come down by the Dimrill Stair into the deep vale of the Dwarves. There lies the Mirrormere, and there the River Silverlode rises in its icy springs.’
- The Fellowship of the Ring (Book 2), Chapter 3
The Redhorn Pass (or Redhorn Gate) is the only pass over the Misty Mountains south of the High Pass and north of the Gap of Rohan. A narrow and dangerous high path, it leads along the southern slopes of Caradhras toward the Dimrill Dale and then onward to the Vale of Anduin.