It rises from a small pool or lake near Tel Hushben,[143] about six miles to the south-west of the Baalbek ruins.
Springing from this source, which belongs to Antilibanus rather than to Lebanon, the Litany shortly receives a large accession to its waters from the opposite side of the valley, and thus augmented flows along the lower Buka'a in a direction which is generally a little west of south, receiving on either side a number of streams and rills from both mountains, and giving out in its turn numerous canals for irrigation.
As the river descends with numerous windings, but still with the same general course, the valley of the Buka'a contracts more and more, till finally it terminates in a gorge of a most extraordinary character.
Nothing in the conformation of the strata, or in the lie of ground, indicates the coming marvel[144]--the roots of Lebanon and Hermon appear to intermix--and the further progress of the river seems to be barred by a rocky ridge stretching across the valley from east to west, when lo! suddenly, the ridge is cut, as if by a knife, and a deep and narrow chasm opens in it, down which the stream plunges in a cleft 200 feet deep, and so narrow that in one place it is actually bridged over by masses of rock which have fallen from the cliffs above.[145] In the gully below fig-trees and planes, besides many shrubs, find a footing, and the moist walls of rock on either side are hung with ferns of various kinds, among which is conspicuous the delicate and graceful maidenhair.

Further down the chasm deepens, first to 1,000 and then to 1,500 feet, "the torrent roars in the gorge, milk-white and swollen often with the melting snow, overhung with semi-tropical oleanders, fig-trees, and oriental planes, while the upper cliffs are clad with northern vegetation, two zones of climate thus being visible at once."[146] Where the gorge is the deepest, opposite the Castle of Belfort (the modern Kulat-esh-Shukif), the river suddenly makes a turn at right angles, altering its course from nearly due south to nearly due west, and cuts through the remaining roots of Lebanon, still at the bottom of a tremendous fissure, and still raging and chafing for a distance of fifteen miles, until at length it debouches on the coast plain, and meanders slowly through meadows to the sea,[147] which it enters about five miles to the north of Tyre.

The course of the Litany may be roughly estimated at from seventy to seventy-five miles.
The other streams to which Lebanon gives birth flow either from its northern or its western flank.

From the northern flank flows one stream only, the Nahr-el-Kebir or Eleutherus.

The course of this stream is short, not much exceeding thirty miles.