`There is the land where our fathers worked of old, and we have wrought the image of those mountains into many works of metal and of stone, and into many songs and tales. They stand tall in our dreams: Baraz, Zirak, Shathûr.
`Only once before have I seen them from afar in waking life, but I know them and their names, for under them lies Khazad-dûm, the Dwarrowdelf, that is now called the Black Pit, Moria in the Elvish tongue. Yonder stands Barazinbar, the Redhorn, cruel Caradhras; and beyond him are Silvertine and Cloudyhead: Celebdil the White, and Fanuidhol the Grey, that we call Zirak-zigil and Bundushathûr.
- FotR; The Ring Goes South, just to point out it streached under three mountains
The passage twisted round a few turns, and then began to descend. It went steadily down for a long while before it became level once again. The air grew hot and stifling, but it was not foul, and at times they felt currents of cooler air upon their faces, issuing from half-guessed openings in the walls. There were many of these. In the pale ray of the wizard's staff, Frodo caught glimpses of stairs and arches and of other passages and tunnels, sloping up, or running steeply down, or opening blankly dark on either side. It was bewildering beyond hope of remembering.
Gimli... was not... troubled by the mere darkness in itself. Often the wizard consulted him at points where the choice of way was doubtful; but it was always Gandalf who had the final word. The Mines of Moria were vast and intricate beyond the imagination of Gimli, Glóin's son, dwarf of the mountain-race though he was.
- FotR; A Journey in the Dark (already quoted but anyway
There were not only many roads to choose from, there were also in many places holes and pitfalls, and dark wells beside the path in which their passing feet echoed. There were fissures and chasms in the walls and floor, and every now and then a crack would open right before their feet. The widest was more than seven feet across.... The noise of churning water came up from far below, as if some great mill-wheel was turning in the depths.
- FotR; A Journey in the Dark
Before [Gandalf] stood a wide dark arch opening into three passages: all led in the same general direction, eastwards; but the left-hand passage plunged down, while the right-hand climbed up, and the middle way seemed to run on, smooth and level but very narrow...
- FotR; A Journey in the Dark
[For] a second they saw a vast roof far above their heads upheld by many mighty pillars hewn of stone. Before them and on either side stretched a huge empty hall; its black walls, polished and smooth as glass, flashed and glittered. Three other entrances they saw, dark black arches: one straight before them eastwards, and one on either side.
- FotR; A Journey in the Dark
'How long is that going to take us? ' asked Frodo.
'I cannot say,' answered Gandalf. 'It depends on many chances. But going straight, without mishap or losing our way, we shall take three or four marches, I expect. It cannot be less than forty miles from West-door to East-gate in a direct line, and the road may wind much.'
- FotR; A Journey in the Dark
'I now know where we are. This must be, as Gimli says, the Chamber of Mazarbul; and the hall must be the twenty-first of the North-end. Therefore we should leave by the eastern arch of the hall, and bear right and south, and go downwards. The Twenty-first Hall should be on the Seventh Level, that is six above the level of the Gates.'
- FotR; The Bridge of Khazad-dûm