chasm

Their number was formidable, now that he had begun to fear, and yet these names, powerful though they were, had often caused him to smile with the same kind of satisfaction experienced by a traveller who from the summit of a mountain beholds at his feet the craggy eminences, the almost impassable paths, and the fearful chasms, through which he has so perilously climbed.

A huge rock, falling from above, boomed past me, struck the path, and bounded over into the chasm.

Around this opening, which had, possibly, for ages permitted a free entrance to the brilliant moonbeams that now illumined the vast pile, grew a quantity of creeping plants, whose delicate green branches stood out in bold relief against the clear azure of the firmament, while large masses of thick, strong fibrous shoots forced their way through the chasm, and hung floating to and fro, like so many waving strings.

The shaft into which the river hurls itself is an immense chasm, lined by glistening coal-black rock, and narrowing into a creaming, boiling pit of incalculable depth, which brims over and shoots the stream onward over its jagged lip.