The county of Knox is bounded as follows: Commencing at the southwest corner of township twenty-nine, north, of range eight, west; thence east to the southeast corner of township twenty-nine, north, of range two, west; thence north to the middle of the main channel of the Missouri River; thence along the middle of the main channel of said river to the point where the dividing line between ranges eight and nine, west, intersects the same; thence south to the place of beginning.