And ye shall point out your east border from Hazarenan to Shepham:

Jamieson-Fausset-Brown Bible Commentary

10-12. 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.

Matthew Henry's Concise Commentary

34:1-15 Canaan was of small extent; as it is here bounded, it is but about 160 miles in length, and about 50 in breadth; yet this was the country promised to the father of the faithful, and the possession of the seed of Israel. This was that little spot of ground, in which alone, for many ages, God was known. This was the vineyard of the Lord, the garden enclosed; but as it is with gardens and vineyards, the narrowness of the space was made up by the fruitfulness of the soil. Though the earth is the Lord's, and the fulness thereof, yet few know him, and serve him; but those few are happy, because fruitful to God. Also, see how little a share of the world God gives to his own people. Those who have their portion in heaven, have reason to be content with a small pittance of this earth. Yet a little that a righteous man has, having it from the love of God, and with his blessing, is far better and more comfortable than the riches of many wicked.