Shepham, the first point after Hazar-enan, is unknown. The name Riblah is by some read Har-bel, i. e., "the Mountain of Bel;" the Har-baal-Hermon of Judges 3:3. No more striking landmark could be set forth than the summit of Hermon, the southernmost and by far the loftiest peak of the whole Antilibanus range, rising to a height of 10,000 feet, and overtopping every other mountain in the Holy land. Ain, i. e. the fountain, is understood to be the fountain of the Jordan; and it is in the plain at the southwestern foot of Hermon that the two most celebrated sources of that river, those of Daphne and of Paneas, are situate.
The "sea of Chinnereth" is better known by its later name of Gennesaret, which is supposed to be only a corruption of Chinnereth. The border ran parallel to this sea, along the line of hill about 10 miles further east.

And ye shall point out your east border from Hazarenan to Shepham. From the place where the northern border ended, which Jerom says (u) the Hebrews call Apamia, as both the Targums of Jonathan and Jerusalem do here. Shepham was a city between Hazarenan and Riblah in the tribe of Naphtali, where Adrichomius (w) places it.
(u) Comment. ut supra. (cf. ver. 15.) (w) Theatrum Terrae Sanct. p. 114.

east border--This is very clearly defined. Shepham and Riblah, which were in the valley of Lebanon, are mentioned as the boundary line, which commenced a little higher than the sources of the Jordan. Ain is supposed to be the source of that river; and thence the eastern boundary extended along the Jordan, the sea of Chinnereth (Lake of Tiberias), the Jordan; and again terminated at the Dead Sea. The line being drawn on the east of the river and the seas included those waters within the territory of the western tribes.

The Eastern Boundary. - If we endeavour to trace the upper line of the eastern boundary from the fountain-place just mentioned, it ran from Hazar-enan to Shepham, the site of which is unknown, and "from Shepham it was to go down to Riblah, on the east of Ain" (the fountain). The article הרבלה, and still more the precise description, "to the east of Ain, the fountain, or fountain locality" (Knobel), show plainly that this Riblah is to be distinguished from the Riblah in the land of Hamath (2-Kings 23:33; 2-Kings 25:21; Jeremiah 39:9; Jeremiah 52:27), with which it is mostly identified. Ain is supposed to be "the great fountain of Neba Anjar, at the foot of Antilibanus, which is often called Birket Anjar, on account of its taking its rise in a small reservoir or pool" (Robinson, Bibl. Res. p. 498), and near to which Mej-del-Anjar is to be seen, consisting of "the ruins of the walls and towers of a fortified town, or rather of a large citadel" (Robinson, p. 496; cf. Ritter, xvii. pp. 181ff.).
(Note: Knobel regards Ain as the source of the Orontes, i.e., Neba Lebweh, and yet, notwithstanding this, identifies Riblah with the village of Ribleh mentioned above. But can this Ribleh, which is at least eight hours to the north of Neba Lebweh, be described as on the east of Ain, i.e., Neba Lebweh?)
From this point the boundary went farther down, and pressed (מחה) "upon the shoulder of the lake of Chinnereth towards the east," i.e., upon the north-east shore of the Sea of Galilee (see Joshua 19:35). Hence it ran down along the Jordan to the Salt Sea (Dead Sea). According to these statements, therefore, the eastern boundary went from Bekaa along the western slopes of Antilibanus, over or past Rasbeya and Banyas, at the foot of Hermon, along the edge of the mountains which bound the Huleh basin towards the east, down to the north-east corner of the Sea of Galilee; so that Hermon itself (Jebel es Sheikh) did not belong to the land of Israel.