Numbers 34:11

And the coast shall go down from Shepham to Riblah, on the east side of Ain; and the border shall descend, and shall reach unto the side of the sea of Chinnereth eastward:

Shepham ... Riblab - 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.