The river; either Euphrates, or a branch of it, called Chabras, by which there is even at this day a city called Rahabath-melic, i.e. King's Rahabath, as the learned observe; or some other river of note in those times and parts.
Related Commentaries of Genesis 36:37
Genesis 36:37
37 And Samlah died, and Saul of Rehoboth by the river reigned in his stead.