The county of Holt is bounded as follows: Commencing at the southwest corner of township twenty-five, north, of range sixteen, west; thence east to the southeast corner of township twenty-five, north, of range nine, west; thence north to the middle of the main channel of the Niobrara River, thence up said channel to a point where the second guide meridian intersects the same; thence south along said second guide meridian, to the place of beginning.