'Strongholds' in the Bible

Hear this and pay close attention, O priests!Give heed, O house of Israel!Listen, O house of the king!For the [pronounced] judgment pertains to you and is meant for you to hear,Because you have been a snare at MizpahAnd a net spread out over Tabor (military strongholds on either side of the Jordan River).

Israel has forgotten his maker and built palaces, and Judah has multiplied fortified cities; but I will send fire on his cities and it will devour her strongholds.