right side: i.e. the south side, facing east.
river of Gad. the river valley belonging to Gad, which was the Jabbok.
Related Commentaries of 2 Samuel 24:5
2 Samuel 24:5
5 And they passed over Jordan, and pitched in Aroer, on the right side of the city that lieth in the midst of the rivera of Gad, and toward Jazer: