- The Hollin Gate also known as the Doors of Durin or the West-gate is the Entrance to Moria from Nan Sirannon outside Echad Dúnann in Eregion just outside the Walls of Moria.
- Since the early days of Middle-earth, the greatest kingdom of the dwarves lay beneath the Misty Mountains in the halls called Khazad-dûm. In those days, when there was trade between the dwarves and the Elves of both Eregion and Lothlórien, a vital trade route ran through Khazad-dûm from the West-gate (also called the Hollin Gate) and the Great Gate in Dimrill Dale in the east.
- The Hollin Gate was special. It was built by the smith Narvi and set with runes and symbols by Celebrimbor, the Elven jewel-smith who also forged the Elf-rings Narya, Nenya, and Vilya. He wrought the signs out of ithildin, a metal that reflects the light of the moon. When moon did not shine, the Gate remained hidden and undetectable to any who looked upon it. Celebrimbor’s runes spelled out a riddle, and the doors would only open to a friend who spoke the answer.
- "Ennyn Durin Aran Moria. Pedo Mellon a Minno. Im Narvi hain echant. Celebrimbor o Eregion teithant i thiw hin."
- "The Doors of Durin, Lord of Moria. Speak, friend, and enter. I, Narvi, made them. Celebrimbor of Hollin drew these signs."
- The inscription stated the password that would cause the Doors to swing open.
- J.R.R. Tolkien, The Lord of the Rings, The Fellowship of the Ring, "A Journey in the Dark"