Joshua 8:11 - Ellicott's Commentary On The Whole Bible

On the north side. — The lurking-place of the thirty thousand was on the west side, between Bethel and Ai. There is a ravine called the Wady Maheesin which runs nearly east and west, on the north of et-Tel, and probably Joshua’s main body took up a position on the rising ground to the north of this ravine, for it is added, “the ravine (or Gai) was between them and Ai.”