‘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
The Dimrill Dale is a valley at the feet of the mountains Caradhras, Celebdil, and Fanuidhol. In the Years of the Trees, Durin I founded the Dwarven realm of Moria here. The Great Gates, the realm's original entrance, lie here. In the valley's centre sits the Mirrormere, a small lake.