The county of Cedar is bounded as follows: Commencing at a point in the middle of the main channel of the Missouri River, at which the line dividing ranges one and two, west, crosses said river; thence south to the southwest corner of township twenty-nine, north, of range one, west; thence east to the southeast corner of township twenty-nine, north, of range one, west; thence south to the southeast corner of township twenty-eight, north, of range one, west; thence east to the southeast corner of township twenty-eight, north, of range three, east; thence north to the middle of the main channel of the Missouri River; thence up said channel to the place of beginning.