Jamieson, Fausset and Brown on Joshua 12:7

Jos 12:7-24. The One and Thirty Kings on the West Side of Jordan, Which Joshua Smote.

7. Baal-gad ... even unto ... Halak--(See on Jos 11:17). A list of thirty-one chief towns is here given; and, as the whole land contained a superficial extent of only fifteen miles in length by fifty in breadth, it is evident that these capital cities belonged to petty and insignificant kingdoms. With a few exceptions, they were not the scenes of any important events recorded in the sacred history, and therefore do not require a particular notice.