Adam Clarke on Genesis 31:21

Passed over the river - The Euphrates, as the Targum properly notices. But how could he pass such a river with his flocks, etc.? This difficulty does not seem to have struck critics in general. The rabbins felt it, and assert that God wrought a miracle for Jacob on this occasion, and that he passed over dry shod. As we know not in what other way he could pass, it is prudent to refer it to the power of God, which accompanied him through the whole of his journey. There might, however, have been fords well known to both Jacob and Laban, by which they might readily pass.

The mount Gilead - What the ancient name of this mountain was, we know not; but it is likely that it had not the name of Gilead till after the transaction mentioned Gen 31:47. The mountains of Gilead were eastward of the country possessed by the tribes of Reuben and Gad; and extended from Mount Hermon to the mountains of Moab - Calmet. It is joined to Mount Libanus, and includes the mountainous region called in the New Testament Trachonitis - Dodd.