"The day waned, and the dusk was twined about the boles of the trees. At last the hobbits saw, rising dimly before them, a steep dark land: they had come to the feet of the mountains, and to the green roots of tall Methedras. Down the hillsided the young Entwash, leaping from its springs high above, ran noisily from step to step to meet them. On the right of the stream there was a long slope, clad with grass, now grey in the twilight. No trees grew there and it was open to the sky; stars were shining already in lakes between shores of cloud."
The Two Towers, chapter 4