The two tribes and a half erected this altar in order to keep alive their claim to have the same interest as the other tribes had in the sanctuary of God, which was established on the west side of Jordan: and in order to forestall any assertion that the Jordan itself was a natural barrier of exclusion between them and the sanctuary, they built it on the west or Canaanite bank of the Jordan and not on the east.
The word rendered “borders” is noteworthy; it means circuits, arrondissements.