The Damour or Tamyras drains the western flank of Lebanon to the south of Jebel Sunnin (about Lat. 33º 45’), the districts known as Menassif and Jourd Arkoub, about Barouk and Deir-el-Kamar.  It collects the waters from an area of about 110 square miles, and carries them to the sea in a course which is a little north of west, reaching it half-way between Khan Khulda (Heldua) and Nebbi Younas.  The scenery along its banks is tame compared with that of the more northern rivers.

The Nahr-el-Auly or Bostrenus rises from a source to the north-east of Barouk, and flows in a nearly straight course to the south-west for a distance of nearly thirty-five miles, when it is joined by a stream from Jezzin, which flows into it from the south-east.  On receiving this stream, the Auly turns almost at a right angle, and flows to the west down the fine alluvial track called Merj Bisry, passing from this point through comparatively low ground, and between swelling hills, until it reaches the sea two miles to the north of Sidon.  Its entire course is not less than sixty miles.

The Zaherany repeats on a smaller scale the course of the Bostrenus.  It rises near Jerju’a from the western flank of Jebel Rihan, the southern extremity of the Lebanon range, and flows at first to the south-west.  The source is “a fine large fountain bursting forth with violence, and with water enough for a mill race."[157] From this the river flows in a deep valley, brawling and foaming along its course, through tracts of green grass shaded by black walnut-trees for a distance of about five miles, after which, just opposite Jerju’a, it breaks through one of the spurs from Rihan by a magnificent chasm.  The gorge is one “than which there are few deeper or more savage in Lebanon.  The mountains on each side rise up almost precipitously to the height of two or three thousand feet above the stream, that on the northern bank being considerably the higher.  The steep sides of the southern mountain are dotted with shrub, oak, and other dwarf trees."[158] The river descends in its chasm still in a south-west direction until, just opposite Arab Salim, it “turns round the precipitous corner or bastion of the southern Rihan into a straight valley,” and proceeds to run due south for a short distance.  Meeting, however, a slight swell of ground, which blocks what would seem to have been its natural course, the river “suddenly turns west,” and breaking through a low ridge by a narrow ravine, pursues its way by a course a little north of west to the Mediterranean, which it enters about midway between Sidon and Sarepta.[159] The length of the stream, including main windings, is probably not more than thirty-five miles.