The Hebrew word mishor means a level place, plain, or tableland in its geographical sense, and uprightness, equity, or straightness in its moral sense. It derives from the root yashar (H3474, to be straight, right). This dual meaning beautifully connects the physical landscape with moral character — what is level is also what is just and fair.
Isaiah 40:4 prophesies that the rough ground will become a mishor — a level plain — preparing the way for the LORD. This image of making crooked paths straight and rough places smooth is central to the theology of repentance and preparation for God's coming. The moral dimension appears in the Psalms, where the psalmist asks God to lead him on a mishor — a level, upright path. God Himself judges with mishor — equity and fairness. The word unites geography and ethics in a single vision of God's kingdom.