There was only a narrow bridge of stone without a parapet, as narrow as a pony could well walk on;

There upon Celebdil was a lonely window in the snow, and before it lay a narrow space, a dizzy eyrie above the mists of the world.

And the steps were narrow, spaced unevenly, and often treacherous: they were worn and smooth at the edges, and some were broken, and some cracked as foot was set upon them.